BUG 10920 "Add subtitles inside a drop-down" SOLVED

- New feature, add subtitles inside a drop-down
- Has created an xml options file specific to the field optgroup
* Available from version ProcessMaker-2.0.47 (2.5.1)
Merge pull request #1630 from victorsl/BUG-10920

BUG 10920 "Add subtitles inside a drop-down" SOLVED