Validate name presence on client-side as well

* remove email address validation, we have it covered by html itself and it's quite annoying
* add shakeError animation
* fix styles a bit

src/i18n/en.json

@@ -74,9 +74,9 @@
     "registration": "Registration",
     "token": "Invite token",
     "validations": {
-      "username_required": "username should not be blank",
+      "username_required": "should not be blank",
+      "fullname_required": "should not be blank",
       "email_required": "should not be blank",
-      "email_valid": "should be valid email",
       "password_required": "should not be blank",
       "password_confirmation_required": "should not be blank",
       "password_confirmation_match": "should be the same as password"

src/i18n/ru.json

@@ -58,8 +58,8 @@
     "token": "Код приглашения",
     "validations": {
       "username_required": "не должно быть пустым",
+      "fullname_required": "не должно быть пустым",
       "email_required": "не должен быть пустым",
-      "email_valid": "должен быть корректный email адрес",
       "password_required": "не должен быть пустым",
       "password_confirmation_required": "не должно быть пустым",
       "password_confirmation_match": "должно совпадать с паролем"