I have the same problem as the previous speakers.
ü ö and ä sometimes with one? shown.
I tried everything that was suggested here
kopano-localize-folder blabla utf8 etc.
Customize / etc / locale
nothing helps …
the only thing that fixes the problem for a short time is a reboot
of the apache webserver.
after the prompt for new application appears, the
Implementation of the umlauts correctly. if the user logs off two to three times
the umlauts are no longer translated correctly.
I have now suspected that my apache copies any files in its cache.
That’s why I’ve tried caching off.
GET /webapp/client/resources/images/loading_m.png HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
Accept-Encoding: gzip, deflate
Cookie: lang=de_DE.UTF-8; encryption-store-key=a8d7811fa6c6e77b3fb4c11e31b24212; KOPANO_WEBAPP=59mfrdc9d104s080nmp2usjvs4
HTTP/1.1 200 OK
Date: Mon, 17 Sep 2018 18:32:06 GMT
Server: Apache/2.4.25 (Debian)
Last-Modified: Mon, 13 Aug 2018 14:35:25 GMT
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Keep-Alive: timeout=5, max=100
but somehow that does not seem to help.
I could reboot the apache every five minutes via a cron job.
This solution is somehow silly.
Sorry if my english is very scary …
Thanks for any help…