loleaflet: enable l10n of context menu items which come from src files from LO

loleaflet/Makefile

@@ -30,6 +30,7 @@ dist: all
 
 pot:
 	xgettext --from-code=UTF-8 --keyword=_ --output=po/loleaflet-ui.pot \
+		unocommands.js \
 		dist/errormessages.js \
 		dist/toolbar/toolbar.js \
 		src/control/Control.Tabs.js \

loleaflet/unocommands.js

+var CopyHyperlinkLocation = _('Copy Hyperlink');
+var DecrementLevel = _('Down One Level');
+var IncrementLevel = _('Up One Level');
+var EditAnnotation = _('Edit Comment');
+var InsertAnnotation = _('Insert Comment');
+var Merge = _('Merge');
+var MergeCells = _('Merge Cells...');
+var ObjectBackOne = _('Bring Forward');
+var ObjectForwardOne = _('Send Backward');
+var PasteSpecial = _('Paste Special');
+var PasteUnformatted = _('Unformatted Text');