[gcompris] Fix invalid characters in Croatian UI translation

[Andre Klapper <aklapper src gnome org>]

commit 09adaa111b827df53fc370a75a3cba7f4dceba3b
Author: Andre Klapper <a9016009 gmx de>
Date:   Sat Aug 29 14:50:18 2020 +0200

    Fix invalid characters in Croatian UI translation

 po/hr.po | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/po/hr.po b/po/hr.po
index 5dd795833..2d00e31ac 100644
--- a/po/hr.po
+++ b/po/hr.po
@@ -4149,7 +4149,7 @@ msgstr "Pamćenje"
 msgid "Find the matching pair"
 msgstr "Pronađi odgovarajući par"
 
-#. TRANSLATORS: Put here the mathematical operators "+-��" for  your language.
+#. TRANSLATORS: Put here the mathematical operators '+-x/' for  your language.
 #: src/boards/memory.c:864
 msgid "+-×÷"
 msgstr "+-*/"