diff --git a/web/public/static/langs/cy.json b/web/public/static/langs/cy.json
index 0967ef42..68846b8f 100644
--- a/web/public/static/langs/cy.json
+++ b/web/public/static/langs/cy.json
@@ -1 +1,43 @@
-{}
+{
+    "notifications_delete": "Dileu",
+    "action_bar_sign_in": "Mewngofnodi",
+    "notifications_copied_to_clipboard": "Wedi'i gopio i'r clipfwrdd",
+    "common_cancel": "Canslo",
+    "nav_button_account": "Cyfrif",
+    "common_save": "Arbed",
+    "common_add": "Ychwanegu",
+    "signup_title": "Creu cyfrif ntfy",
+    "signup_form_username": "Enw defnyddiwr",
+    "signup_form_password": "Cyfrinair",
+    "action_bar_logo_alt": "logo ntfy",
+    "action_bar_settings": "Gosodiadau",
+    "action_bar_profile_title": "Proffil",
+    "action_bar_profile_logout": "Allgofnodi",
+    "message_bar_publish": "Cyhoeddi neges",
+    "notifications_attachment_copy_url_button": "Copio URL",
+    "notifications_attachment_open_title": "Ewch i {{url}}",
+    "publish_dialog_base_url_label": "URL y Gwasanaeth",
+    "publish_dialog_priority_high": "Blaenoriaeth uchel",
+    "publish_dialog_title_label": "Teitl",
+    "publish_dialog_message_label": "Neges",
+    "publish_dialog_attach_label": "URL Atodiad",
+    "publish_dialog_filename_label": "Enw ffeil",
+    "publish_dialog_filename_placeholder": "Enw ffeil yr atodiad",
+    "action_bar_account": "Cyfrif",
+    "action_bar_unsubscribe": "Dad-danysgrifio",
+    "login_title": "Mewngofnodi i'ch cyfrif ntfy",
+    "login_form_button_submit": "Mewngofnodi",
+    "action_bar_change_display_name": "Newid enw arddangos",
+    "action_bar_profile_settings": "Gosodiadau",
+    "nav_button_settings": "Gosodiadau",
+    "nav_button_documentation": "Dogfennaeth",
+    "alert_not_supported_context_description": "Dim ond dros HTTPS y gellir derbyn cyhoeddiadau. Mae hyn yn gyfyngiad ar yr API <mdnLink>Notifications</mdnLink>.",
+    "notifications_attachment_open_button": "Agor atodiad",
+    "notifications_attachment_file_document": "dogfen arall",
+    "notifications_click_open_button": "Agor linc",
+    "publish_dialog_base_url_placeholder": "URL y Gwasanaeth, e.e. https://example.com",
+    "publish_dialog_attach_placeholder": "Atodi ffeil drwy URL, e.e. https://f-droid.org/F-Droid.apk",
+    "notifications_click_copy_url_button": "Copio linc",
+    "notifications_actions_open_url_title": "Ewch i {{url}}",
+    "publish_dialog_email_label": "Ebost"
+}