Make valid filter for all files
Summary:
Fix filter so files can be actually listed and opened from file dialog.
On occasion, make filter translatable.
Test Plan: Run kdiff3, click "Fileā¦" button, try to select any file in dialog.
Reviewers: mreeves
Reviewed By: mreeves
This issue does not seem to impact my test machine but the change causes no problems.
Differential Revision: https://phabricator.kde.org/D21885