Move all strings in use to strings.xml
Currently we partly rely on strings used from ics-openvpn. While this had the benefit that we could reuse existing translations for a bunch of languages, it has the disadvantage that some languages or single strings in particular languages are missing in ics-openvpn. If we move all used strings to our strings.xml the translators get a chance to fix these missing strings.
We got a concrete complaint about a missing greek translation of "Disconnect" and "Cancel", which cannot be resolved in the current situation.