[mutter] Fix broken markup in Welsh UI translation

[Andre Klapper <aklapper src gnome org>]

commit 38fb59a6a6709e018690b3e8fdbc8c8d769d647a
Author: Andre Klapper <a9016009 gmx de>
Date:   Thu Mar 5 00:43:05 2020 +0100

    Fix broken markup in Welsh UI translation

 po/cy.po | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/po/cy.po b/po/cy.po
index 6c1830804..936f060bc 100644
--- a/po/cy.po
+++ b/po/cy.po
@@ -3669,7 +3669,7 @@ msgid ""
 "type=\"%s\" style_set=\"whatever\"/> element"
 msgstr ""
 "Dim arddull ffrâm wedi ei osod ar gyfer y math ffenest \"%s\" yn y thema \"%s"
-"\", ychwanegwch elfen <window type=\"%s\" style_set\"beth bynnag\"/>"
+"\", ychwanegwch elfen <window type=\"%s\" style_set=\"beth bynnag\"/>"
 
 #: ../src/ui/theme.c:5207 ../src/ui/theme.c:5269 ../src/ui/theme.c:5332
 #, c-format