Add shortcuts and helpers to editors

From the editor point of view is usefull to know wether a post have or have not a translation to a specific language. Also is good to have a quick overview of the translation status, knowing at a glance how many posts needs translation.

In my plugin there was 2 shortcuts for this:

One in the post listing, as a new column, showing the flags of each language and a PLUS icon to add a translation or a pencil icon to edit an existing translation. (screenshot at http://hacklab.com.br/files/2012/11/Seleção_004.png)


The same flags were present in a metabox inside the edit-post page.

Also, in the edit screen, there was a metabox with the full text of each translation for that post. This is helpfull to the editor so he can look at the post he is translating (screenshot at http://hacklab.com.br/files/2012/11/Seleção_005.png)


The issue mentions no files, tests, or entry points, so first map the editor and post-listing code that handles translations. Done means showing language status with add/edit icons in both editor contexts and displaying each post's full translations in an edit-screen metabox.

Written by the indexing model from the issue text.