Add gene editor; update protein builder and molecule editor
Add Catalan (Valencia)
Merge pull request #2572 from edx/sarina/add-catalan

Add Catalan (Valencia)
Documentation for Image Modal tool
Merge pull request #2519 from edx/markhoeber/documentation/stud-1258

First draft of documentation for Image Modal tool
Store locations in ReferenceLists so they can be converted to locators.

STUD-1027
Update info about gene explorer, molecule editor, and protein builder
Add new Gene Explorer screen shot
Merge pull request #2567 from edx/sylvia/documentation/BLD-701

Add gene editor; update protein builder and molecule editor
Remove specific advanced setting info from ORA
Update screen shots for advanced settings in Specialized Problems
Merge pull request #2581 from edx/sylvia/documentation/TIM-137

Sylvia/documentation/tim 137
Merge pull request #2503 from edx/christina/conditional

Conditional module changes to support Locator/Location conversion.
Added hint/feedback feature to multiple choice response