Add .upper to admin CSS

@@ -1711,3 +1711,7 @@ a, input, textarea, select {
 .wp-admin.is-not-admin #icl_string_translations tbody td:nth-child(4) {
 .wp-admin.is-not-admin #icl_string_translations tbody td:nth-child(4) {
     display: none;
     display: none;
 }
 }
+
+.upper {
+    text-transform: uppercase;
+}