Enable Danish in the code.
Beginning of Danish translation of BOSSv3 (before name change).
Remove Danish translation files when uninstalling.
Danish translation of the installer.
Set the language to Danish if installer was run in Danish.
Merge branch 'v0.7-alpha' into danish-translation

Conflicts:
	src/api/api.cpp
	src/api/api.h
	src/backend/globals.cpp
	src/backend/globals.h
	src/backend/helpers.cpp
	src/backend/helpers.h
	src/gui/main.cpp
	src/installer.nsi
Fix `${LANG_ENGLISH}` -> `${LANG_DANISH}`.
`msgmerge -U resources/l10n/da/LC_MESSAGES/loot.po resources/l10n/template.pot`
Merge remote-tracking branch 'origin/l10n-support' into danish-translation

Conflicts:
	src/backend/helpers.cpp
	src/installer.nsi
Merge remote-tracking branch 'origin/v0.7-alpha' into danish-translation
Update Danish .po from .pot.

1) Load old boss.po and run `sed 's/BOSS/LOOT/'` on it and rename it.
2) Run `msgmerge -U resources/l10n/da/LC_MESSAGES/loot.po resources/l10n/template.pot`
Update Danish translation.
Fixed missing bracket.

Also CodeMaid decided to do some formatting.