Registration flow

Now, the tutor can set a general "Bio' during the registration process (/tutor/register/). The 'Bio' component is located in step 3 (Informations) of the registration flow.

Update (22/02):

• Successfully merged registration flows for learners and tutors into a single flow

frontend/src/lang/en.json

@@ -232,6 +232,8 @@
   		"addAvailability": "Add Availability",
   		"yourAvailabilities": "Your Availabilities",
   		"remove": "Remove",
+		"loadingTutors": "Loading tutors...",
+  		"firstLanguage": "First Language:",
 		"days": {
 			"monday": "Monday",
 			"tuesday": "Tuesday",