Bug 1156235: add strings to prepare for link modifications for affiliates in Loop conversations. r=Standard8

browser/locales/en-US/chrome/browser/loop/loop.properties

@@ -353,3 +353,5 @@ context_edit_tooltip=Edit Context
 context_hide_tooltip=Hide Context
 context_show_tooltip=Show Context
 context_save_label=Save Context
+context_link_modified=This link was modified.
+context_learn_more_link_label=Learn more.