PPTX: Not all master content is exposed for translation

Created by: Anonymous

Original issue 449 created by @ysavourel on 2015-03-02T22:32:20.000Z:

Reported by a user.

Extract text from the attached PPTX file, with "Translate Masters" enabled. Master content for the body slide ("Click to edit Master title style", ..., "Fifth level") is exposed correctly. However, this is not the only master content in the document. There is also a title master used by the first slide of the presentation, which contains the strings "Click to edit Master title style for slide 1" and "Click to edit Master subtitle style for slide 1. This content is not exposed for translation.