Add translate API (#72)

src/schema.graphql

@@ -38,6 +38,16 @@ type Query {
   interiors(filter: InteriorsFilterInput): [Interior]
   signedFileUploadURL(config: SignedUploadURLInput): SignedUploadURL
     @cacheControl(maxAge: 0)
+  translate(input: TranslateInput!): StringResult!
+}
+
+input TranslateInput {
+  text: String!
+  """
+  defaults to auto
+  """
+  sourceLanguageCode: String
+  targetLanguageCode: String!
 }
 
 input SignedUploadURLInput {
@@ -449,6 +459,10 @@ input ProductProportionsInput {
   marginHeightMin: Int!
 }
 
+type StringResult {
+  value: String!
+}
+
 type IdNumberResult {
   id: Int!
 }