Fix account page forms & add account actions rspec

#5

config/locales/en.yml

@@ -167,6 +167,9 @@ en:
               blank: Your email cannot be empty
             username:
               blank: Your username cannot be empty
+              taken: This username is already taken
+            password:
+              blank: Your password cannot be empty
   categories:
     destroy:
       notice: Category deleted
@@ -290,6 +293,7 @@ en:
       settings: Settings
       sign_in: Sign in
       save: Save
+      save_password: Save password
       start: Click here to start your participation
       stopwatch_continue: Continue
       stopwatch_pause: Pause
@@ -352,7 +356,7 @@ en:
       notice: Settings updated
       title: "My settings"
       general_section: "General settings"
-      password_section: "Change password"
+      password_section: "Password"
     index:
       title: "All users"
     new: