diff --git a/lang/cy/preferences.php b/lang/cy/preferences.php
index 24e5baaed..eae4a896f 100644
--- a/lang/cy/preferences.php
+++ b/lang/cy/preferences.php
@@ -29,16 +29,16 @@ return [
     'notifications_watched' => 'Eitemau Gwylio ac Anwybyddu',
     'notifications_watched_desc' => 'Isod ceir yr eitemau sydd â dewisiadau gwylio penodol wedi\'u cymhwyso. I ddiweddaru eich dewisiadau ar gyfer y rhain, edrychwch ar yr eitem yna dewch o hyd i\'r opsiynau gwylio yn y bar ochr.',
 
-    'auth' => 'Access & Security',
-    'auth_change_password' => 'Change Password',
-    'auth_change_password_desc' => 'Change the password you use to log-in to the application. This must be at least 8 characters long.',
-    'auth_change_password_success' => 'Password has been updated!',
+    'auth' => 'Mynediad a Diogelwch',
+    'auth_change_password' => 'Newid Cyfrinair',
+    'auth_change_password_desc' => 'Newidiwch y cyfrinair rydych chi’n ei ddefnyddio i fewngofnodi i’r rhaglen. Rhaid i gyfrineiriau fod yn 8 nod o leiaf.',
+    'auth_change_password_success' => 'Mae\'r cyfrinair wedi\'i ddiweddaru!',
 
-    'profile' => 'Profile Details',
-    'profile_desc' => 'Manage the details of your account which represents you to other users, in addition to details that are used for communication and system personalisation.',
-    'profile_view_public' => 'View Public Profile',
-    'profile_name_desc' => 'Configure your display name which will be visible to other users in the system through the activity you perform, and content you own.',
-    'profile_email_desc' => 'This email will be used for notifications and, depending on active system authentication, system access.',
+    'profile' => 'Manylion Proffil',
+    'profile_desc' => 'Rheoli manylion eich cyfrif sy\'n eich cynrychioli chi i ddefnyddwyr eraill, yn ogystal â manylion a ddefnyddir ar gyfer cyfathrebu a phersonoli systemau.',
+    'profile_view_public' => 'Gweld Proffil Cyhoeddus',
+    'profile_name_desc' => 'Ffurfweddwch eich enw arddangos a fydd yn weladwy i ddefnyddwyr eraill yn y system trwy\'r hyn yr ydych yn ei wneud, a\'r cynnwys rydych chi\'n berchen arno.',
+    'profile_email_desc' => 'Bydd yr e-bost hwn yn cael ei ddefnyddio ar gyfer hysbysiadau a, gan ddibynnu ar ddilysiad system gweithredol, mynediad i’r system.',
     'profile_email_no_permission' => 'Unfortunately you don\'t have permission to change your email address. If you want to change this, you\'d need to ask an administrator to change this for you.',
     'profile_avatar_desc' => 'Select an image which will be used to represent yourself to others in the system. Ideally this image should be square and about 256px in width and height.',
     'profile_admin_options' => 'Administrator Options',