Add generated translations to the .gitignore (#3159)

The *.qm binary translation files are generated from the translation *.ts files and should not be tracked by git since they are generated.

Qt.gitignore

@@ -28,6 +28,7 @@ ui_*.h
 *.jsc
 Makefile*
 *build-*
+*.qm
 
 # Qt unit tests
 target_wrapper.*