RTF output keep inline code red within non-translatable section

[Former user]

Original [issue 9](https://code.google.com/p/okapi/issues/detail?id=9) created by @ysavourel on 2009-03-03T16:47:46.000Z:

Using the extraction to RTF on a bilingual XLIFF, the inline code of the <source> are set with internal style rather than external. This is related to the context of the GenericSkeletonWriter.