Update webapp/app/locales/en-us.json

Co-Authored-By: Mathieu Côté <mcote@mirego.com>

webapp/app/locales/en-us.json

@@ -95,7 +95,7 @@
         "mistakes": {
           "title": "Common mistakes",
           "item_1": "Export Accent files locally before a sync. This will force you to resolve conflicts locally and potentially override reviewed texts or adding removed strings.",
-          "item_2": "Sync a translated language (not your master language). This will effectively generates conflict for all your key, changing the text of the master language for your translated language.",
+          "item_2": "Sync a translated language (not your master language). This will effectively generates conflicts for all your keys, changing the text of the master language for your translated language.",
           "item_3": "Sync one file per language. The purpose of the \"file\" in Accent is to be translated in X languages. Sync your master language and let the translated languages be translated in the UI."
         }
       }