Update res/values-ar/strings.xml

update by Anwar
Pagens are no longer calculated on the main thread.
Updated README to better reflect the option to run your own server.
Update res/values-de/strings.xml

Fixed Umlaut
Update res/values-de/strings.xml

added missing translation
Merge remote-tracking branch 'anwar/patch-1' into 2.0_bugfix
Merge branch '2.0_bugfix' into catalog_update
Fixed initialization order of buttons. Fixes #250
Merge branch '2.0_bugfix' into catalog_update
Removed untranslatable strings from German translation.
Merge branch '2.0_bugfix' into catalog_update