run-tests: use json.dumps(separators=) Followup to daff05dcd184 per Martijn Pieters

debugignore: make messages translatable These messages have been overlooked by check-code, because they start with non-alphabet character ('%' or '('). Making these messages translatable seems reasonable, because messages for ui.note(), ui.status(), ui.progress() and descriptive messages for ui.write() in "debug" commands are already translatable in many cases. This is also a part of preparation for making "missing _() in ui message" detection of check-code more exact.