Fixes from Stepan's second review mail:
- Use trS instead of tr in Antiphon 3 in alLEluia.
- Use lsi6 instead of lsi9 in Antiphon 4 in FONtes.
Second patch from Stepan Nemec.
Flexa fixes:
1) fix a buglet in the last commit, missing / syllable separation in ps28
2) add flexas from Nocturnale Romanum also to psalms 45, 65, 95 and 96,
   add corresponding flexas to Czech translations (also for ps28)
3) fix up typesetting of flexa in the first psalm verse
4) put R/. below divisio maxima in oratio