Update gl_ES translations from transifex

[soymgomez]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have searched for plugins that provide already provide the feature

Proposal

I see that https://app.transifex.com/roundcube/roundcube-webmail/content/ has updated the translations for the Galician language (gl_ES).

Is it possible to update this repository with the new translations?

Thank you very much

Motivation and context

Translations are outdated

[alecpl]

Localization in master has been updated. I don't plan to update older version branches.