Add some more synthetic messages

.. so that nobody ever accidentally translates %S, %q, or %s.
These only appear inside MP_ERROR_TEXT for technical reasons.

Author: jepler

locale/synthetic.po

@@ -1,3 +1,15 @@
 # Localization of the locale name is done automagically
 msgid "en_US"
 msgstr ""
+
+# This string should never be translated, but for technical reasons it has to appear as an MP_ERROR_TEXT
+msgid "%S"
+msgstr ""
+
+# This string should never be translated, but for technical reasons it has to appear as an MP_ERROR_TEXT
+msgid "%q"
+msgstr ""
+
+# This string should never be translated, but for technical reasons it has to appear as an MP_ERROR_TEXT
+msgid "%s"
+msgstr ""