i18n bug in method name

[kazuhitoyokoi]

What are the steps to reproduce?

1. Generate Swagger node from petstore Swagger definition.
2. Install generated node using npm install command.
3. Start Node-RED and access to Node-RED flow editor using Japanese language setting.

What happens?

On Node-RED flow editor, Japanese messages are shown except items in method pulldown menu.

What do you expect to happen?

Japanese messages should be shown in the items when node developer modified Japanese language file.

Please tell us about your environment:

• Node-RED version: v0.18.4
• node.js version: v6.11.3
• npm version: v3.10.10
• Platform/OS: Ubuntu 16.04
• Browser: Google Chrome 63.0.3239.132（Official Build）（64 bit）on Windows 10