Remove version from application create

Because of exception when upgrading
Added sanity check and logging
2.99.30 beta
Slovenian language updated
Merge pull request #1884 from kv1dr/patch-14

Updated Slovenian translation
Updated changelog
Updated FAQ
Flush asked once cache too

Thanks @an0n981
Server: do not serve update if done before
Updated changelog
Cache category restriction result

Refs #1885
merge