Update tooltip and toast messages

src/app/[lang]/locales/en/api.json

@@ -32,7 +32,7 @@
   },
   "GoogleForms": {
     "formAlreadyExists": "Google form already exists",
-    "formCreated": "Google form successfully created and sended in Slack!",
+    "formCreated": "Google form successfully created and sended in Slack to participants!",
     "formCreationFailed": "Failed to create Google form",
     "formDeleted": "Google form successfully deleted"
   },

src/app/[lang]/locales/en/components.json

@@ -105,7 +105,7 @@
   "CreateFeedbackButton": {
     "button": "Feedback",
     "tooltip": {
-      "active": "Creates a Google Form for course feedback and sends it in Slack",
+      "active": "Creates a Google Form for course feedback and sends it in Slack to the participants",
       "disabled": "The feedback form for this course exists already"
     }
   },