SOGo missing support for non-ascii characters

Sure, there it is:

Jan 09 20:16:03 sogod [16784]: <0x0x5566aaf46030[iCalWeeklyRecurrenceCalculator]> Add range 2020-01-13 11:00:00 +0000 - 2020-01-13 12:00:00 +0000
Jan 09 20:16:03 sogod [16784]: 127.0.0.1 "GET /SOGo/so/user/Calendar/eventslist?asc=1&day=20200109&filterpopup=view_next7&search=title_Category_Location&sort=start&value= HTTP/1.0" 200 963/0 0.075 - - 0
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: 127.0.0.1 "POST /SOGo/so/user/Calendar/4190-5E178980-7-65C4E080/save HTTP/1.0" 204 0/1073 0.080 - - 0
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: 127.0.0.1 "POST /SOGo/so/user/Calendar/saveFoldersActivation HTTP/1.0" 204 0/14 0.014 - - 0
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: 127.0.0.1 "GET /SOGo/so/user/Calendar/eventsblocks?ed=20200112&sd=20200106&view=weekview HTTP/1.0" 200 1028/0 0.017 - - 0
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: 127.0.0.1 "GET /SOGo/so/user/Calendar/eventslist?asc=1&day=20200109&filterpopup=view_next7&search=title_Category_Location&sort=start&value= HTTP/1.0" 200 439/0 0.032 - - 0
root@yuno:/home/admin#  tail -n 50 /var/log/sogo/sogo.log
Jan 09 20:16:03 sogod [16784]: <0x0x5566aaf46030[iCalWeeklyRecurrenceCalculator]> Add range 2020-01-13 11:00:00 +0000 - 2020-01-13 12:00:00 +0000
Jan 09 20:16:03 sogod [16784]: 127.0.0.1 "GET /SOGo/so/user/Calendar/eventslist?asc=1&day=20200109&filterpopup=view_next7&search=title_Category_Location&sort=start&value= HTTP/1.0" 200 963/0 0.075 - - 0
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:04 sogod [16784]: 127.0.0.1 "POST /SOGo/so/user/Calendar/4190-5E178980-7-65C4E080/save HTTP/1.0" 204 0/1073 0.080 - - 0
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: 127.0.0.1 "POST /SOGo/so/user/Calendar/saveFoldersActivation HTTP/1.0" 204 0/14 0.014 - - 0
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'root@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'admin@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'webmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'postmaster@yuno.<redacted-domain>+attributes': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user+defaults': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: <0x0x5566aa644b10[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [2044]: 127.0.0.1 "GET /SOGo/so/user/Calendar/eventsblocks?ed=20200112&sd=20200106&view=weekview HTTP/1.0" 200 1028/0 0.017 - - 0
Jan 09 20:16:06 sogod [16784]: <0x0x5566aa743500[SOGoCache]> an error occurred when caching value for key 'user+settings': "SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY"
Jan 09 20:16:06 sogod [16784]: 127.0.0.1 "GET /SOGo/so/user/Calendar/eventslist?asc=1&day=20200109&filterpopup=view_next7&search=title_Category_Location&sort=start&value= HTTP/1.0" 200 439/0 0.032 - - 0

I performed the above commands and confirmed my system uses en_US UTF-8 locale. Unfortunately, the issue still persists