diff --git a/src/strings/cy.json b/src/strings/cy.json
index 9c8035157e..9c4331783b 100644
--- a/src/strings/cy.json
+++ b/src/strings/cy.json
@@ -447,5 +447,29 @@
     "ColorTransfer": "Trosglwyddo lliw",
     "ColorSpace": "Gofod lliw",
     "ColorPrimaries": "Sylfaenol lliwiau",
-    "LabelAccessDay": "Diwrnod yr wythnos:"
+    "LabelAccessDay": "Diwrnod yr wythnos:",
+    "HeaderCancelSeries": "Canslo Cyfres",
+    "HeaderCancelRecording": "Canslo Recordiad",
+    "HeaderAutoDiscovery": "Canfod Rhwydwaith",
+    "HeaderAudioSettings": "Gosodiadau Sain",
+    "HeaderAudioBooks": "Llyfrau Sain",
+    "HeaderAddUser": "Ychwanegu Defnyddiwr",
+    "HeaderAdditionalParts": "Rhannau Ychwanegol",
+    "HeaderActiveRecordings": "Gweithredol Recordiadau",
+    "HeaderActiveDevices": "Gweithredol Dyfeisiau",
+    "HeaderAccessSchedule": "Amserlen Mynediad",
+    "GuideProviderSelectListings": "Dewis Rhestriadau",
+    "GuestStar": "Seren wadd",
+    "GroupVersions": "Fersiynau grŵp",
+    "Fullscreen": "Sgrin lawn",
+    "FormatValue": "Fformat: {0}",
+    "ExtraLarge": "Mawr Ychwanegol",
+    "EveryHour": "Bob awr",
+    "Engineer": "Peiriannydd sain",
+    "CancelSeries": "Canslo cyfres",
+    "CancelRecording": "Canslo recordiad",
+    "ButtonSelectDirectory": "Dewis Cyfeiriadur",
+    "TypeOptionPluralAudio": "Synau",
+    "OptionSpecialEpisode": "Penodau arbennig",
+    "LabelProfileCodecs": "Codeciaid:"
 }