Fix(l10n): Update translations from Transifex

Signed-off-by: Nextcloud bot <bot@nextcloud.com>

l10n/cy_GB.js

@@ -2,6 +2,7 @@ OC.L10N.register(
     "deck",
     {
     "Personal" : "Personol",
+    "%s on %s" : "%s ar %s",
     "Done" : "Done",
     "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form" : "Mae'r ffeil lwythwyd i fyny'n fwy na chyfarwyddeb MAX_FILE_SIZE bennwyd yn y ffurflen HTML",
     "No file was uploaded" : "Ni lwythwyd ffeil i fyny",
@@ -9,6 +10,7 @@ OC.L10N.register(
     "Cancel" : "Diddymu",
     "Details" : "Manylion",
     "Tags" : "Tagiau",
+    "Activity" : "Gweithred",
     "Undo" : "Dadwneud",
     "Can edit" : "Can edit",
     "Can share" : "Can share",