Use Composer for dependencies
Use Gallery name for the composer installers
Merge branch 'pr/3' into 3.0

Add composer support

Signed-off-by: Rachman Chavik <rchavik@xintesa.com>
Use correct translation domain
Update translation files
Translated using Weblate (Dutch (ISO 639-2))

Currently translated at 95.5% (64 of 67 strings)
Merge branch 'pr/4' into 3.0

Translations