remove outdated icon update message

* otherwise it is shown for OC caches incorrectly
* users should have migrated all old GC caches since a long time
fix: OC connector didn't set timestamp of cache

* lead to "updated 15000 days ago"
refactoring: more fault tolerant OC parsing
Swedish translation update

New and update translations for the last two months....
Merge pull request #2345 from YraFyra/translation

Swedish translation update