fix(l10n): Translate l10n/messages.pot in gl

100% translated source file: 'l10n/messages.pot'
on 'gl'.

l10n/gl.pot

@@ -207,6 +207,10 @@ msgstr "Ton de pel claro"
 msgid "Load more \"{options}\""
 msgstr "Cargar máis «{options}»"
 
+#. TRANSLATORS: The button is in a loading state
+msgid "Loading …"
+msgstr "Cargando…"
+
 #. TRANSLATORS: A color name for RGB(45, 115, 190)
 msgid "Mariner"
 msgstr "Marino"