Add the Welsh translation of the changelog

Progress towards #233

app/views/changelog/_changelog_cy.html.haml

@@ -1,134 +1,140 @@
 %section#main.c-changelog
-  %h1.heading-large [TODO Welsh translation] UK House Price Index: change history
+  %h1.heading-large Mynegai Prisiau Tai y DU: hanes newid
 
-  %h2.heading-medium April 2020 – Changes to local authority geograph in England and Scotland
+  %h2.heading-medium Ebrill 2020 – Newidiadau i ddaearyddiaeth awdurdod lleol yn Lloegr a’r Alban
 
   %p
-    The Office for National Statistics (ONS) will make the following
-    changes to local authority geography in England and Scotland.
+    Bydd y Swyddfa Ystadegau Gwladol (ONS) yn gwneud y newidiadau canlynol i
+    ddaearyddiaeth awdurdodau lleol yn Lloegr a’r Alban.
 
   %table.u-documentation-table
     %thead
       %tr
         %th
-          Former local authorities
+          Cyn-awdurdodau lleol
         %th
-          New structure and geography code
+          Strwythur a chod daearyddiaeth newydd
         %th
-          Data and publication date
+          Data a dyddiad cyhoeddi
     %tbody
       %tr
         %td
           Bournemouth (E06000028), Christchurch (E07000048), Poole (E06000029)
         %td
-          Bournemouth, Christchurch and Poole (E06000058)
+          Bournemouth, Christchurch a Poole (E06000058)
         %td
-          February 2020 (to be published on 22 April 2020)
+          Chwefror 2020 (i’w gyhoeddi ar 22 Ebrill 2020)
       %tr
         %td
-          East Dorset (E07000049), North Dorset (E07000050), Purbeck (E07000051), West Dorset (E07000052), Weymouth and Portland (E07000053)
+          Dwyrain Dorset (E07000049), Gogledd Dorset (E07000050), Purbeck (E07000051), Gorllewin Dorset (E07000052), Weymouth a Portland (E07000053)
         %td
           Dorset (E06000059)
         %td
-          February 2020 (to be published on 22 April 2020)
+          Chwefror 2020 (i’w gyhoeddi ar 22 Ebrill 2020)
       %tr
         %td
-          Taunton Deane (E07000190), West Somerset (E07000191)
+          Taunton Deane (E07000190), Gorllewin Gwlad yr Haf (E07000191)
         %td
-          Somerset West and Taunton (E07000246)
+          Gorllewin Gwlad yr Haf a Taunton (E07000246)
         %td
-          February 2020 (to be published on 22 April 2020)
+          Chwefror 2020 (i’w gyhoeddi ar 22 Ebrill 2020)
       %tr
         %td
           Forest Heath (E07000201), St Edmundsbury (E07000204)
         %td
-          West Suffolk (E07000245)
+          Gorllewin Suffolk (E07000245)
         %td
-          February 2020 (to be published on 22 April 2020)
+          Chwefror 2020 (i’w gyhoeddi ar 22 Ebrill 2020)
       %tr
         %td
-          Suffolk Coastal (E07000205), Waveney (E07000206)
+          Arfordir Suffolk (E07000205), Waveney (E07000206)
         %td
-          East Suffolk (E07000244)
+          Dwyrain Suffolk (E07000244)
         %td
-          February 2020 (to be published on 22 April 2020)
+          Chwefror 2020 (i’w gyhoeddi ar 22 Ebrill 2020)
       %tr
         %td
-          City of Glasgow (S12000046)
+          Dinas Glasgow (S12000046)
         %td
-          City of Glasgow* (S12000049)
+          Dinas Glasgow* (S12000049)
         %td
-          February 2020 (to be published on 22 April 2020)
+          Chwefror 2020 (i’w gyhoeddi ar 22 Ebrill 2020)
       %tr
         %td
-          North Lanarkshire (S12000044)
+          Gogledd Swydd Lanark (S12000044)
         %td
-          North Lanarkshire* (S12000050)
+          Gogledd Swydd Lanark* (S12000050)
         %td
-          February 2020 (to be published on 22 April 2020)
+          Chwefror 2020 (i’w gyhoeddi ar 22 Ebrill 2020)
       %tr
         %td
-          Aylesbury Vale (E07000004), Chiltern (E07000005), South Bucks (E07000006), Wycombe (E07000007)
+          Dyffryn Aylesbury (E07000004), Chiltern (E07000005), De Bucks (E07000006), Wycombe (E07000007)
         %td
-          Buckinghamshire (E06000060)
+          Swydd Buckingham (E06000060)
         %td
-          April 2020 (to be published on 17 June 2020)
+          Ebrill 2020 (i’w gyhoeddi ar 17 Mehefin 2020)
 
-  %h2.heading-medium April 2019 – UK and Scotland changes
+  %h2.heading-medium Ebrill 2019 – Newidiadau y Deyrnas Unedig a’r Alban
   %p
-    One of the England regions has officially changed name, and two of the Scotland
-    regions have changed ONS GSS code since this service was first set up. While
-    users of the app will see the new name reflected in the location search
-    and the map selector, users who utilise the SPARQL query function should
-    be aware that the data URI for a re-named area has not changed.
+    Mae un o ranbarthau Lloegr wedi newid ei enw yn swyddogol, ac mae dau
+    o ranbarthau’r Alban wedi newid cod ONS GSS ers i’r gwasanaeth hwn gael
+    ei sefydlu gyntaf. Er y bydd defnyddwyr yr ap yn gweld yr enw newydd
+    wedi ei adlewyrchu yn y chwiliad lleoliad a’r dewisydd map, dylai defnyddwyr
+    sy’n defnyddio’r swyddogaeth ymholi SPARQL fod yn ymwybodol nad yw data URI
+    ar gyfer yr ardal a ail-enwyd wedi newid.
 
-  %p The new local authority name is:
+  %p Enw’r awdurdod lleol newydd yw:
 
   %ul.list.list-bullet
     %li
-      Folkestone and Hythe (formerly Shepway),
+      Folkestone a Hythe (Shepway cyn hynny),
+      %br
+      mae’r URI yr un fath:
       %br
-      the URI remains:
       %code http://landregistry.data.gov.uk/id/region/shepway
 
-  %p In Scotland:
+  %p Yn yr Alban:
   %ul.list.list-bullet
     %li
       Fife
       %br
-      ONS GSS code: S12000047 (formerly S12000015),
+      cod ONS GSS: S12000047 (S12000015 cyn hynny),
       %br
-      the URI remains
+      mae’r URI yr un fath:
       %code http://landregistry.data.gov.uk/doc/region/fife
     %li
-      Perth and Kinross
+      Perth a Kinross
       %br
-      ONS GSS code: S12000048 (formerly S12000024),
+      cod ONS GSS: S12000048 (S12000024 cyn hynny),
       %br
-      the URI remains
+      mae’r URI yr un fath:
       %code
         http://landregistry.data.gov.uk/doc/region/perth-and-kinross
 
-  %p Date of change: 17th April 2019
+  %p Dyddiad newid: 17 Ebrill 2019
 
 
-  %h2.heading-medium August 2017 – Northern Ireland changes
+  %h2.heading-medium Awst 2017 – Newidiadau Gogledd Iwerddon
   %p
-    Three of the Northern Ireland regions have officially
-    changed name since this service
-    was first set up. While users of the app will see the new names reflected in the
-    location search and the map selector, users who utilise the SPARQL
-    query function should be aware the data URI for a re-named area has not changed.
-    The new local authority names are:
+    Mae tri o ranbarthau Gogledd Iwerddon wedi newid eu henwau yn
+    swyddogol ers i’r gwasanaeth hwn gael ei sefydlu gyntaf. Er y
+    bydd defnyddwyr yr ap yn gweld yr enwau newydd wedi eu hadlewyrchu
+    yn y chwiliad lleoliad a’r dewisydd map, dylai defnyddwyr sy’n
+    defnyddio’r swyddogaeth ymholi SPARQL fod yn ymwybodol nad yw data
+    URI ar gyfer yr ardal a ail-enwyd wedi newid. Enwau’r awdurdod
+    lleol newydd yw:
 
   %ul.list.list-bullet
     %li
-      Ards and North Down (formerly North Down and Ards), the URI remains:
+      Ards a Gogledd Down (Gogledd Down ac Ards cyn hynny), mae’r URI yr un fath:
+      %br
       %code http://landregistry.data.gov.uk/id/region/north-down-and-ards
     %li
-      Armagh City Banbridge and Craigavon (formerly Armagh Bainbridge and Craigavon),
-      the URI remains
+      Dinas Armagh Banbridge a Craigavon (Armagh Bainbridge a Craigavon cyn hynny),
+      mae’r URI yr un fath:
+      %br
       %code http://landregistry.data.gov.uk/doc/region/armagh-banbridge-and-craigavon
     %li
-      Derry City and Strabane (formerly Derry and Strabane), the URI remains
+      Dinas Derry a Strabane (Derry a Strabane cyn hynny), mae’r URI yr un fath:
+      %br
       %code http://landregistry.data.gov.uk/doc/region/derry-and-strabane