Missing galician plural format

gl language code is correct:

• https://www.loc.gov/standards/iso639-2/php/langcodes_name.php?iso_639_1=gl

Plural format is correct:

• http://docs.translatehouse.org/projects/localization-guide/en/latest/l10...
• https://translate.fedoraproject.org/languages/gl/#information

Patch failed of incorrect whitespace use. A new patch is attached.