[PATCH 0 of 9 ] prevent translation for some rst syntax

[Simon Heimberg]

In the past, rst syntax has been translated several times. 
Improve the situation by two concepts. Translation files do not contain 
entries containing noting but directives (rst syntax: ..XXX::) and 
untranslatable arguments. And remind the translator by writing a note before 
paragraphs with directives.

Update the german translation after each patch on i18n/posplit to show the 
effect of the change.

Patch 1 is not required, but makes sense before hacking posplit. (See patch 
description for more details.)