Added reset button to text change.

public/_locales/en/messages.json

@@ -402,10 +402,16 @@
     "customServerAddressDescription": {
         "message": "The address SponsorBlock uses to make calls to the server.\nUnless you have your own server instance, this should not be changed."
     },
-    "saveCustomServerAddress": {
+    "save": {
         "message": "Save"
     },
+    "reset": {
+        "message": "Reset"
+    },
     "customAddressError": {
         "message": "This address is not in the right form. Make sure you have http:// or https:// at the begining and no slashes or sub-folders at the end."
+    },
+    "areYouSureReset": {
+        "message": "Are you sure you would like to reset this?"
     }
 }