Added Google Two Factor Authentication. Closes #326.

app/lang/en/forms.php

@@ -4,19 +4,21 @@ return [
 
     // Setup form fields
     'setup' => [
-        'email'          => 'Email',
-        'username'       => 'Username',
-        'password'       => 'Password',
-        'site_name'      => 'Site Name',
-        'site_domain'    => 'Site Domain',
-        'site_timezone'  => 'Select your timezone',
-        'site_locale'    => 'Select your language',
+        'email'            => 'Email',
+        'username'         => 'Username',
+        'password'         => 'Password',
+        'site_name'        => 'Site Name',
+        'site_domain'      => 'Site Domain',
+        'site_timezone'    => 'Select your timezone',
+        'site_locale'      => 'Select your language',
+        'enable_google2fa' => 'Enable Google Two Factor Authentication',
     ],
 
     // Login form fields
     'login' => [
         'email'    => 'Email',
         'password' => 'Password',
+        '2fauth'   => 'Authentication Code',
     ],
 
     // Incidents form fields
@@ -79,6 +81,9 @@ return [
         'password'     => 'Password',
         'api-key'      => 'API Key',
         'api-key-help' => 'Regenerating your API key will revoke all existing applications.',
+        '2fa'          => [
+            'help' => 'Enabling two factor authentication increases security of your account. You will need to download <a href="https://support.google.com/accounts/answer/1066447?hl=en">Google Authenticator</a> or a similar app on to your mobile device. When you login you will be asked to provide a token generated by the app.',
+        ],
     ],
 
     // Buttons