Punctuation not correctly localized

[gkln]

In the following:

https://github.com/discourse/discourse/blob/4d65370797d87d90741f2f3774b7c6dccdb6a7ae/app/assets/javascripts/discourse/models/topic.js.es6#L70

The colon should be part of the localized string, not the code.

Thank you!

[zogstrip (Régis Hanol)]

Feel free to submit a pull request