diff --git a/i18n/cy.json b/i18n/cy.json
index f5315343..74289177 100644
--- a/i18n/cy.json
+++ b/i18n/cy.json
@@ -23,6 +23,8 @@
 	"templatedata-doc-param-type-unknown": "Anhysbys",
 	"templatedata-doc-param-type-url": "URL",
 	"templatedata-doc-param-type-wiki-file-name": "Ffeil",
+	"templatedata-doc-param-type-wiki-template-name": "Nodyn",
+	"templatedata-doc-param-type-wiki-user-name": "Defnyddiwr",
 	"templatedata-doc-params": "Paramedrau'r nodyn",
 	"templatedata-invalid-empty-array": "Rhaid bod o leiaf un gwerth yn arae y briodwedd \"$1\".",
 	"templatedata-invalid-length": "Y data yn rhy fawr i'w roi ar gadw ({{formatnum:$1}} {{PLURAL:$1|beit|beit|feit|beit}}, {{formatnum:$2}}) yw'r {{PLURAL:$2|maint mwyaf}}",
@@ -39,7 +41,11 @@
 	"templatedata-modal-current-language": "Iaith gyfredol: $1",
 	"templatedata-modal-format-block": "Bloc",
 	"templatedata-modal-format-inline": "Mewn-lein",
+	"templatedata-modal-json-error-replace": "Disodli",
+	"templatedata-modal-table-param-name": "Enw",
 	"templatedata-modal-table-param-required": "Gofynnol",
+	"templatedata-modal-table-param-type": "Math",
+	"templatedata-modal-title-choose-language": "Dewis iaith",
 	"templatedata-modal-title-language": "Iaith",
 	"templatedata-modal-title-paramorder": "Trefn y paramedrau"
 }