crowdin.yaml: Add support for Galician

Change-Id: I5f0888e10686cf100afa5df49dace0b7cb133646
diff --git a/crowdin.yaml b/crowdin.yaml
index 9482c4a..fb1054d 100644
--- a/crowdin.yaml
+++ b/crowdin.yaml
@@ -45,6 +45,7 @@
         fa: fa
         fi: fi
         fr: fr
+        gl: gl
         he: iw
         hi: hi
         hr: hr