Localization support for the extension message

[testforstephen]

Currently the extension has supported english and italian for configuration settings, help wanted for other locales.

[Eskibear]

Any instructions?

[yaohaizh]

@Eskibear This PR for your reference: #463

[testforstephen]

Have supported Chinese version for user settings and launch.json configurations. Help wanted for other locales.

[pablojimpas]

I've just added Spanish support in #904 waiting to be merged.
It's 100% complete although some translations are hard and could be a little bit more precise or be left in English.