Front localization support

[aurelien-roy]

This PR moves every string from template files into lang files enabling front localization.

It doesn't include mail template localization (cf #402 (comment)_ )
Closes #402

[daftspunk]

The markup provided by components is generally intended as a usage example for the Component.

https://octobercms.com/docs/cms/components#customizing-default-markup

Realistically if this is a problem for you, you can create a boilerplate theme with the translations in it and reuse that across all your projects

[inalto]

Hello,
I'd like to try to look at this from a different perspective.
I think having pretranslated basic strings for the components is a good idea.
In my case I have multiple installations in multiple languages that are updated by automatic scripts.
For educational purposes you can maybe put a comment next to the original language content.
Moving the translations into the theme is a possible solution but in my opinion it is more efficient to have them in the plugin in case of multiple installations.
This way you can comfortably update multiple installations automatically without having to take into account different translations between themes on a case by case basis.

Of course for those who manage a single project this makes no sense. :)
Thank you for your work.