add context for 'English' translation string

messages.po

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2018-08-22 14:12-0400\n"
+"POT-Creation-Date: 2018-08-22 14:16-0400\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -1113,7 +1113,10 @@ msgstr ""
 msgid "Convert Line to Satin"
 msgstr ""
 
-#: templates/convert_to_satin.inx:12 templates/embroider.inx:23
+#. This is used for the submenu under Extensions -> Ink/Stitch.  Translate this
+#. to your language's word for its language, e.g. "Español" for the spanish
+#. translation.
+#: templates/convert_to_satin.inx:12 templates/embroider.inx:24
 #: templates/flip.inx:12 templates/install.inx:12
 #: templates/layer_commands.inx:16 templates/object_commands.inx:14
 #: templates/params.inx:12 templates/print.inx:12 templates/simulate.inx:12

templates/embroider.inx

@@ -20,6 +20,7 @@
         <object-type>all</object-type>
         <effects-menu>
             <submenu name="Ink/Stitch">
+                {# L10N This is used for the submenu under Extensions -> Ink/Stitch.  Translate this to your language's word for its language, e.g. "Español" for the spanish translation. #}
                 <submenu name="{% trans %}English{% endtrans %}" />
             </submenu>
         </effects-menu>