Translate '/config/locales/blacklight-gallery.en.yml' in 'ar'

[transifex-integration[bot]]

The translations for the following file are now complete:

Parameter	Value
Source file	'/config/locales/blacklight-gallery.en.yml'
Translation file	'config/locales/blacklight-gallery.ar.yml'
Language code	'ar'
Transifex project slug	blacklight-gallery
Transifex resource slug	config-locales-blacklight-gallery-en-yml--master
Transifex event	review_completed

[camillevilla]

Thank you to our translation partners at Qatar National Library!