webui: capitalize labels of undo and undo all buttons

Make the label of these buttons consistent with other buttons which have
capital first letters.

Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>

install/ui/test/data/ipa_init.json

@@ -574,8 +574,8 @@
                         "next": "Next",
                         "page": "Page",
                         "prev": "Prev",
-                        "undo": "undo",
-                        "undo_all": "undo all",
+                        "undo": "Undo",
+                        "undo_all": "Undo All",
                         "validation": {
                             "error": "Text does not match field pattern",
                             "datetime": "Must be an UTC date/time value (e.g., \"2014-01-20 17:58:01Z\")",

ipalib/plugins/internal.py

@@ -719,8 +719,8 @@ class i18n_messages(Command):
             "next": _("Next"),
             "page": _("Page"),
             "prev": _("Prev"),
-            "undo": _("undo"),
-            "undo_all": _("undo all"),
+            "undo": _("Undo"),
+            "undo_all": _("Undo All"),
             "validation": {
                 "error": _("Text does not match field pattern"),
                 "datetime": _("Must be an UTC date/time value (e.g., \"2014-01-20 17:58:01Z\")"),