Added locals for buttons

_locales/en/messages.json

@@ -12,6 +12,15 @@
         "message": "Skip over sponsorship on YouTube videos. Report sponsors on videos you watch to save the time of others.",
         "description": "Description of the extension."
     },
+    "clearTimes": {
+        "message": "Clear Sponsor Times"
+    },
+    "openPopup": {
+        "message": "Open SponsorBlock Popup"
+    },
+    "SubmitTimes": {
+        "message": "Submit Sponsor Times"
+    },
     "helpPage": {
         "message": "index_en.html"
     },