diff --git a/js/src/i18n/cy.json b/js/src/i18n/cy.json
index 2469db677..3a6380bcb 100644
--- a/js/src/i18n/cy.json
+++ b/js/src/i18n/cy.json
@@ -138,5 +138,70 @@
   "Gather ⋅ Organize ⋅ Mobilize": "Casglu ⋅ Trefnu ⋅ Symud",
   "General": "Cyffredinol",
   "General information": "Gwybodaeth gyffredinol",
+  "Getting location": "Cael lleoliad",
+  "Go": "Ewch",
+  "Group name": "Enw'r grŵp",
+  "Group {displayName} created": "Grŵp {displayName} wedi'i greu",
+  "Groups": "Grwpiau",
+  "Hide replies": "Prif lun",
+  "I create an identity": "Rwy'n creu hunaniaeth",
+  "I have a Mobilizon account": "Nid oes gen i gyfrif Mobilizon",
+  "I have an account on another Mobilizon instance.": "Mae gen i gyfrif ar achos arall o Mobilizon.",
+  "I participate": "Rwy'n cymryd rhan",
+  "I want to allow people to participate without an account.": "Rwyf am ganiatáu i bobl gymryd rhan heb gyfrif.",
+  "I want to approve every participation request": "Rwyf am gymeradwyo pob cais cyfranogi",
+  "Identity {displayName} created": "Hunaniaeth {displayName} wedi'i chreu",
+  "Identity {displayName} deleted": "Hunaniaeth {displayName} wedi'i dileu",
+  "Identity {displayName} updated": "Diweddarwyd hunaniaeth {displayName}",
+  "If an account with this email exists, we just sent another confirmation email to {email}": "Os oes cyfrif gyda'r e-bost hwn yn bodoli, rydym newydd anfon e-bost cadarnhau arall at {email}",
+  "If this identity is the only administrator of some groups, you need to delete them before being able to delete this identity.": "Os mai'r hunaniaeth hon yw unig weinyddwr rhai grwpiau, mae angen i chi eu dileu cyn gallu dileu'r hunaniaeth hon.",
+  "If you want, you may send a message to the event organizer here.": "Os ydych chi eisiau, efallai y byddwch chi'n anfon neges at drefnydd y digwyddiad yma.",
+  "Instance Name": "Enw'r achos",
+  "Instance Terms": "Telerau Achos",
+  "Instance Terms Source": "Ffynhonnell Telerau Achos",
+  "Instance Terms URL": "URL Telerau Achos",
+  "Instance settings": "Gosodiadau achos",
+  "Instances": "Achosion",
+  "Join <b>{instance}</b>, a Mobilizon instance": "Ymunwch â <b> {instance} </b>, achos Mobilizon",
+  "Last published event": "Digwyddiad cyhoeddedig diwethaf",
+  "Last week": "Wythnos diwethaf",
+  "Learn more": "Dysgu mwy",
+  "Learn more about Mobilizon": "Dysgu mwy am Mobilizon",
+  "Leave event": "Gadael digwyddiad",
+  "Leaving event \"{title}\"": "Yn gadael digwyddiad \"{title}\"",
+  "License": "Trwydded",
+  "Limited number of places": "Nifer cyfyngedig o leoedd",
+  "Load more": "Llwythwch fwy",
+  "Locality": "Lleoliad",
+  "Log in": "Mewngofnodi",
+  "Log out": "Allgofnodi",
+  "Login": "Mewngofnodi",
+  "Login on Mobilizon!": "Mewngofnodi ar Mobilizon!",
+  "Login on {instance}": "Mewngofnodi ar {instance}",
+  "Manage participations": "Rheoli cyfranogiadau",
+  "Mark as resolved": "Marciwch fel y'i datryswyd",
+  "Members": "Aelodau",
+  "Message": "Neges",
+  "Mobilizon is a federated network. You can interact with this event from a different server.": "Rhwydwaith ffederal yw Mobilizon. Gallwch ryngweithio â'r digwyddiad hwn gan weinydd gwahanol.",
+  "Moderated comments (shown after approval)": "Sylwadau wedi'u cymedroli (dangosir ar ôl cael eu cymeradwyo)",
+  "Moderation": "Cymedroli",
+  "Moderation log": "Log cymedroli",
+  "My account": "Fy nghyfrif",
+  "My events": "Fy nigwyddiadau",
+  "My identities": "Fy hunaniaethau",
+  "Name": "Enw",
+  "New email": "E-bost newydd",
+  "New note": "Nodyn newydd",
+  "New password": "Cyfrinair newydd",
+  "New profile": "Proffil newydd",
+  "Next page": "Tudalen nesaf",
+  "No address defined": "Dim cyfeiriad wedi'i ddiffinio",
+  "No closed reports yet": "Dim adroddiadau caeedig eto",
+  "No comment": "Dim sylw",
+  "No comments yet": "Dim sylwadau eto",
+  "No end date": "Dim dyddiad gorffen",
+  "No events found": "Ni chafwyd unrhyw ddigwyddiadau",
+  "No group found": "Ni ddaethpwyd o hyd i grŵp",
+  "No groups found": "Ni ddaethpwyd o hyd i grwpiau",
   "Please do not use it in any real way.": "Peidiwch â'i ddefnyddio mewn unrhyw ffordd go iawn."
 }