Merge branch 'release-2.2'

* release-2.2:
  Bump version for 2.2.12-pl release
  Fixed not working core phpThumb with some extras
  Translated new phrases to German
  Prevent redirect of base_url when query string exists
  Updated copyright dates
  Bump version for 2.2.12 dev
  Do not trigger confirmation dialog when the empty cache checkbox was triggered Affects CacheMaster users.
  Seriously... I think I need coffee
  Oops, put lexicon back in order.
  Improved "prevent navigation" alert by tracking field changes instead of using flawed isDirty() check.
  [REBUILD] Allow disabling the confirm navigation popup