German translation enhancements by Daniel Felix (#12232)
German translation for trunk updated by Daniel Felix (#12232)
German translation for 2.1-stable updated by Daniel Felix (#12232, #12235)
Fixed rendering of just uploaded not yet attached files in non-issue preview.
Prevent error when attachment is not pre-loaded.
Allow rendering of just uploaded not yet attached files in preview.
Adds double quotes in mysql configuration example (#12229).
Wrap issue description and its contextual menu in a div (#12211).
Fixes that test randomly fails.
Use textual CSS class for priorities in alternate theme (#12216).
