updated German translations
Fixing migration bug on MySQL 5.5

MySQL was complaining about a syntax error near "{user}}", noticing a problem with the placeholder name having curly brackets. Adding back ticks solves the issue.
added dbConnection detection for User model and db type check

fixes a bug, where you were not able to run this migration with another --connectionID
Merge remote-tracking branch 'schmunk42/patch-messages-de'
Merge commit 'b40baa1b9e2f72532c67c6054fdaf4158e7cdc64'