The "Profile Management" section has bad indentations because of line breaks around Input templates. I cannot fix it w/o breaking translate tags.
All together the bullet list is indented with ":" which is deprecated.
Furthermore I would suggest to put distro specific hints about sudo into a hint-box.
I see your point. Making pages display properly must be a priority, but joining previous translation units into one new unit creates problems for translators.
The best thing is probably to "reuse" one of the old units - if possible, the one with the most translatable text in it. The other units will disappear from the translation tool, but existing text can always be found in the history of the translated page.
It would be nice to be able to notify translators of what's happening - there used to be a comment field with each unit in the translation tool, but it seems to be gone.
Pipesmoker and I have worked on the appearance, which is improved, and will, I think, keep the translation section together.
For the comments, don't you use the field just above the messages, where it says there is no documentation for that message? There's a link there that opens an edit box. I think that's probably what you need.