Move Google authentication to an external plugin

app/Locale/da_DK/translations.php

@@ -260,9 +260,6 @@ return array(
     // 'External authentication failed' => '',
     // 'Your external account is linked to your profile successfully.' => '',
     'Email' => 'E-Mail',
-    'Link my Google Account' => 'Forbind min Google-konto',
-    'Unlink my Google Account' => 'Fjern forbindelsen til min Google-konto',
-    'Login with my Google Account' => 'Login med min Google-konto',
     'Project not found.' => 'Projekt ikke fundet.',
     'Task removed successfully.' => 'Opgaven er fjernet.',
     'Unable to remove this task.' => 'Opgaven kunne ikke fjernes.',
@@ -395,7 +392,6 @@ return array(
     'Change password' => 'Skift adgangskode',
     'Password modification' => 'Adgangskode ændring',
     'External authentications' => 'Ekstern autentificering',
-    'Google Account' => 'Google-konto',
     'Github Account' => 'Github-konto',
     'Never connected.' => 'Aldrig forbundet.',
     'No account linked.' => 'Ingen kontoer forfundet.',
@@ -846,8 +842,6 @@ return array(
     // 'This chart show the average lead and cycle time for the last %d tasks over the time.' => '',
     // 'Average time into each column' => '',
     // 'Lead and cycle time' => '',
-    // 'Google Authentication' => '',
-    // 'Help on Google authentication' => '',
     // 'Github Authentication' => '',
     // 'Help on Github authentication' => '',
     // 'Lead time: ' => '',
@@ -858,7 +852,6 @@ return array(
     // 'If the task is not closed the current time is used instead of the completion date.' => '',
     // 'Set automatically the start date' => '',
     // 'Edit Authentication' => '',
-    // 'Google Id' => '',
     // 'Github Id' => '',
     // 'Remote user' => '',
     // 'Remote users do not store their password in Kanboard database, examples: LDAP, Google and Github accounts.' => '',