Add Galician translation

Add Galician translation for 3a762c3cf91d6f65a5bb19aeb2056afacd777c71
Add "gl" in module.exports
Add Locale_GL in strings-app.js
Add Galician language in nls/README.md
Updated by ALF automation.
Merge branch 'master' into alf_localization
Updated by ALF automation.
Change Copyright year in strings.js
Merge pull request #8258 from adobe/alf_localization

ALF Automation
Merge pull request #8226 from ivarcia/patch-1

Add Galician translation
Merge branch 'master' of https://github.com/adobe/brackets into larz/css-refactor