[Components][Translation] Custom loaders and dumpers

[raulfraile]

There is no documentation about custom loaders and dumpers for the translation component. Custom loaders/dumpers can be used to support old/custom formats for translation files.

The idea would be to port what I wrote in this post: http://blog.servergrove.com/2014/03/18/symfony2-components-overview-translation/ ("custom loaders" part). If you think it can be useful, I can do it in the next DX hackday.

[javiereguiluz]

@raulfraile thanks for creating this issue and for taking part in the DX initiative. We really appreciate it!

I'm 👍 about your proposal. Given that the translation component already supports lots of common formats, this is a feature that it's not very commonly used by end developers. However, I'd like to document it precisely for being such a dark part of Symfony. Moreover, this could be a clear example of how Symfony is flexible enough to adapt to your needs, no matter how custom they are.

By the way, congratulations on your series of blog posts, which I read and enjoyed!

[wouterj]

Fixed by #4166
For some reason, it looks like GH forgets to close the issue in case some PRs are merged.