Honor err.no_translate during translation (#17)

Author: shaunwarman

.gitignore

@@ -5,3 +5,4 @@ node_modules
 coverage
 .nyc_output
 lib
+package-lock.json

.travis.yml

@@ -1,6 +1,7 @@
 language: node_js
 node_js:
-  - '8'
   - '10'
+  - '12'
+  - 'lts/*'
 after_success:
   npm run coverage

src/index.js

@@ -213,7 +213,9 @@ async function errorHandler(err) {
 function parseValidationError(ctx, err) {
   // translate messages
   const translate = message =>
-    _.isFunction(ctx.request.t) ? ctx.request.t(message) : message;
+    !err.no_translate && _.isFunction(ctx.request.t)
+      ? ctx.request.t(message)
+      : message;
 
   // passport-local-mongoose support
   if (passportLocalMongooseErrorNames.includes(err.name)) {