Changes

Updated submodules
* data c41f42a...1f399c4 (7):
 >  Updated xml files
* src/main/web 7c2eb57...9e89bbf (1):
 > Fix: DocTranscripts w/o images could throw an exception
* src/main/xproc c14be5c...cddcea9 (9):
 > Updated bibliography from wiki
 > Updated oxygen project
 > Fallback docTranscriptNo for pages w/o docTranscripts.
 > Add revisionDesc template
 > Rename extract_testimony-letter
 > Explanatory comments for testimony extraction
 > Adapt p.i.
 > Rework of letter testimony extraction
 > Original script for extraction of letter testimonies
 (commit: 9fccaf5)