Fix Galician locale

[cachelous]

PR Description:

The Galician (gl) translation was in poor shape — a large share of the strings were actually Spanish rather than Galician ("Se ha creado un archivo de registro", "¿Quiere continuar?", etc.), mixed with non-normative Galician, and the file had drifted out of sync with the template.

This PR rewrites the locale from scratch:

• Synced base.po with the current template and removed the obsolete (#~) entries, which only preserved the old Spanish strings.
• Retranslated all 380 strings into normative Galician, with consistent terminology throughout.
• Every string was reviewed by a native speaker (me).

Tests and Checks

• msgfmt --check and ./locales_generator.sh check pass; verified all placeholders and python-brace-format flags are intact (380 translated, 0 fuzzy).