diff --git a/langs/themes/cy.json b/langs/themes/cy.json
index 0967ef424b..5070253e42 100644
--- a/langs/themes/cy.json
+++ b/langs/themes/cy.json
@@ -1 +1,448 @@
-{}
+{
+ "advertising": {
+ "title": "Hysbysebu"
+ },
+ "charging_stations": {
+ "title": "Lleoliadau Gwefru"
+ },
+ "cyclestreets": {
+ "layers": {
+ "2": {
+ "name": "Pob stryd",
+ "title": {
+ "render": "Stryd"
+ }
+ }
+ }
+ },
+ "cyclenodes": {
+ "layers": {
+ "1": {
+ "title": {
+ "mappings": {
+ "0": {
+ "then": "Nod seiclo {rcn_ref}"
+ }
+ }
+ },
+ "tagRenderings": {
+ "node-expected_rcn_route_relations": {
+ "freeform": {
+ "placeholder": "e.e. 3"
+ }
+ },
+ "node-rxn_ref": {
+ "freeform": {
+ "placeholder": "e.e. 1"
+ }
+ }
+ },
+ "presets": {
+ "0": {
+ "title": "nod seiclo"
+ }
+ }
+ },
+ "0": {
+ "name": "Cysylltiadau nod i nod",
+ "title": {
+ "render": "Cyswllt nod i nod"
+ }
+ }
+ },
+ "title": "Rhwydweithiau Nod Seiclo"
+ },
+ "maps": {
+ "title": "Map o fapiau"
+ },
+ "walls_and_buildings": {
+ "title": "Waliau ac adeiladau"
+ },
+ "atm": {
+ "title": "Peiriannau Codi Arian"
+ },
+ "circular_economy": {
+ "layers": {
+ "5": {
+ "override": {
+ "=name": "Siopau ail law"
+ }
+ }
+ }
+ },
+ "benches": {
+ "shortDescription": "Map o feinciau",
+ "title": "Meinciau"
+ },
+ "cafes_and_pubs": {
+ "description": "Tai coffi, tafarndai a bars",
+ "title": "Caffis a thafarndai"
+ },
+ "climbing": {
+ "layers": {
+ "0": {
+ "override": {
+ "tagRenderings+": {
+ "1": {
+ "mappings": {
+ "3": {
+ "then": "Dim ond aelodau o'r clwb"
+ },
+ "0": {
+ "then": "Ar gael yn gyhoeddus i unrhyw un"
+ },
+ "2": {
+ "then": "Dim ond cwsmeriaid"
+ }
+ },
+ "question": "Pwy sy'n gallu mynd yma?"
+ }
+ }
+ }
+ },
+ "2": {
+ "override": {
+ "=presets": {
+ "0": {
+ "title": "siop drwsio esgidiau"
+ }
+ }
+ }
+ }
+ }
+ },
+ "drinking_water": {
+ "title": "Dŵr Yfed"
+ },
+ "elongated_coin": {
+ "title": "Gweisg Ceiniog"
+ },
+ "facadegardens": {
+ "layers": {
+ "0": {
+ "tagRenderings": {
+ "facadegardens-description": {
+ "render": "Rhagor o fanylion: {description}"
+ },
+ "facadegardens-edible": {
+ "mappings": {
+ "0": {
+ "then": "Ceir planhigion bwytadwy"
+ }
+ }
+ },
+ "facadegardens-plants": {
+ "mappings": {
+ "1": {
+ "then": "Ceir planhigion blodeuog"
+ }
+ }
+ }
+ }
+ }
+ }
+ },
+ "food": {
+ "description": "Bwytai a bwyd brys",
+ "title": "Bwytai a bwyd brys"
+ },
+ "healthcare": {
+ "layers": {
+ "5": {
+ "override": {
+ "=presets": {
+ "2": {
+ "title": "optegydd"
+ },
+ "1": {
+ "title": "siop gymorth clyw"
+ }
+ }
+ }
+ }
+ },
+ "title": "Gofal Iechyd"
+ },
+ "hotels": {
+ "title": "Gwestai"
+ },
+ "indoors": {
+ "title": "Dan Do"
+ },
+ "icecream": {
+ "title": "Hufen Iâ"
+ },
+ "kerbs_and_crossings": {
+ "title": "Cyrbiau a chroesfannau",
+ "layers": {
+ "1": {
+ "override": {
+ "=presets": {
+ "0": {
+ "title": "croesfan"
+ }
+ }
+ }
+ }
+ }
+ },
+ "mapcomplete-changes": {
+ "layers": {
+ "0": {
+ "filter": {
+ "11": {
+ "options": {
+ "0": {
+ "question": "Pob platfform"
+ },
+ "2": {
+ "question": "Gwnaed ar y we"
+ },
+ "1": {
+ "question": "Gwnaed ag Android"
+ }
+ }
+ },
+ "4": {
+ "options": {
+ "0": {
+ "question": "Gwnaed cyn {search}"
+ }
+ }
+ },
+ "5": {
+ "options": {
+ "0": {
+ "question": "Gwnaed ar ôl {search}"
+ }
+ }
+ },
+ "2": {
+ "options": {
+ "0": {
+ "question": "Gwnaed gan gyfrannwr {search}"
+ }
+ }
+ },
+ "6": {
+ "options": {
+ "0": {
+ "question": "Cymraeg (cy) {search}"
+ }
+ }
+ }
+ },
+ "tagRenderings": {
+ "version": {
+ "render": "Gwnaed gyda {editor}"
+ },
+ "locale": {
+ "render": "Iaith y defnyddiwr yw {locale}"
+ },
+ "platform": {
+ "mappings": {
+ "0": {
+ "then": "Gwnaed ar y we"
+ }
+ }
+ },
+ "show_changeset_id": {
+ "render": "Grŵp newid {id}"
+ }
+ },
+ "title": {
+ "render": "Grŵp newid am {theme}"
+ },
+ "description": "Dangos pob newid MapComplete"
+ }
+ }
+ },
+ "notes": {
+ "title": "Nodiadau ar OpenStreetMap"
+ },
+ "onwheels": {
+ "layers": {
+ "6": {
+ "override": {
+ "=filter": {
+ "0": {
+ "options": {
+ "0": {
+ "question": "Pob math o gwrb"
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ },
+ "osm_community_index": {
+ "title": "Mynegai Cymunedau OSM"
+ },
+ "postal_codes": {
+ "layers": {
+ "0": {
+ "title": {
+ "render": "Cod post {postal_code}"
+ },
+ "tagRenderings": {
+ "postal_code": {
+ "render": "Y cod post yw {postal_code}"
+ }
+ }
+ },
+ "2": {
+ "title": {
+ "render": "Neuadd y Dref {name}"
+ }
+ }
+ }
+ },
+ "scouting": {
+ "title": "Grwpiau Sgowtio"
+ },
+ "stations": {
+ "layers": {
+ "16": {
+ "name": "Byrddau Ymadael",
+ "title": {
+ "render": "Bwrdd Ymadael"
+ },
+ "presets": {
+ "0": {
+ "title": "bwrdd ymadael"
+ }
+ }
+ },
+ "3": {
+ "name": "Gorsafoedd Trên"
+ }
+ },
+ "title": "Gorsafoedd Trên"
+ },
+ "sports": {
+ "layers": {
+ "4": {
+ "override": {
+ "presets": {
+ "0": {
+ "title": "siop chwaraeon"
+ }
+ }
+ }
+ }
+ }
+ },
+ "sport_pitches": {
+ "shortDescription": "Map sy'n dangos caeau chwaraeon",
+ "title": "Caeau Chwaraeon"
+ },
+ "street_lighting": {
+ "layers": {
+ "2": {
+ "name": "Pob stryd"
+ }
+ },
+ "title": "Golau Stryd"
+ },
+ "transit": {
+ "title": "Ffyrdd Bws"
+ },
+ "trees": {
+ "description": "Mapiwch bob goeden!",
+ "shortDescription": "Mapiwch bob goeden"
+ },
+ "toilets": {
+ "description": "Map o doiledau cyhoeddus",
+ "title": "Toiledau Cyhoeddus"
+ },
+ "vending_machine": {
+ "title": "Peiriannau Gwerthu"
+ },
+ "walkingnodes": {
+ "layers": {
+ "1": {
+ "tagRenderings": {
+ "node-expected_rwn_route_relations": {
+ "freeform": {
+ "placeholder": "e.e. 3"
+ }
+ },
+ "node-rwn_ref": {
+ "freeform": {
+ "placeholder": "e.e. 1"
+ }
+ }
+ },
+ "title": {
+ "render": "Nod cerdded",
+ "mappings": {
+ "0": {
+ "then": "Nod cerdded {rwn_ref}"
+ }
+ }
+ },
+ "presets": {
+ "0": {
+ "title": "nod cerdded"
+ }
+ }
+ },
+ "0": {
+ "name": "Cysylltiadau nod i nod",
+ "title": {
+ "render": "Cyswllt nod i nod"
+ }
+ }
+ },
+ "title": "Rhwydweithiau Nod Cerdded"
+ },
+ "waste": {
+ "title": "Gwastraff"
+ },
+ "waste_basket": {
+ "title": "Biniau Sbwriel",
+ "shortDescription": "Map o finiau sbwriel"
+ },
+ "shops": {
+ "title": "Siopau"
+ },
+ "postboxes": {
+ "title": "Map Blychau Post a Swyddfeydd Post"
+ },
+ "education": {
+ "title": "Addysg"
+ },
+ "openlovemap": {
+ "layers": {
+ "2": {
+ "override": {
+ "=presets": {
+ "0": {
+ "title": "siop erotig"
+ }
+ }
+ }
+ },
+ "6": {
+ "override": {
+ "=presets": {
+ "0": {
+ "title": "sinema erotig"
+ }
+ }
+ }
+ }
+ }
+ },
+ "campersite": {
+ "overrideAll": {
+ "tagRenderings+": {
+ "0": {
+ "question": "Pwy sy'n rhedeg y lleoliad hwn?"
+ }
+ }
+ }
+ }
+}