Node revisions page might not list a default revision

Problem/Motivation

By fixing #2761409: The latest revision isn't always the current revision → we introduced an interesting bug.

When a multilingual site is setup the Node revisions page doesn't show a current revision for all of the translations.

Simple test scenario:

• Create article in English.
• Translate to German and save as a new revision.
• Look at the revisions tab when you are on the English site. You will see only one translation and you do *not* see the current default revision.

So you don't see what is actually published right now.

Proposed resolution

Show all revisions effected by the current language, plus the default revision.

Remaining tasks

Review

User interface changes

Adds the current revision row within the revisions list.

API changes

Data model changes