Version B.2.8.0 available

[Abelardo Pardo]

Hello all.

Version B.2.8.0 is now available. Quite a few new functionalities and fixes:

### Added

- Localization and internationalization support. First language supported, 
  es-ES. There are still a few areas that need polishing, but the bulk of the
  translation is done.
   
- Boolean field in the action-in to request the questions to be shuffled when
  shown to the learners as some surveys suggest (Issue #48)
  
- Function to restrict the values in a column based on the current values. 
  Useful to manage future updates
  
- New folder containing a catalogue of surveys and its corresponding plugins 
  (if applicable)

- Added capacity to retain/forget key columns in the upload/merge steps 
  (Issue #55)
 
- Dashboard now available from the table views (and subviews)

- Script to create users in bulk with a CSV file.

- Functionality to send email now includes CC and BCC fields (Issue #57)

- Possibility to "unmark" a column as key when uploading in CSV (Issue #55)

- Preview screen now shows the value of those variables used when computing 
the personalised message (Issue #47)

### Changed

- Changed configuration scripts to take the environment file name from the 
  environment variable ENV_FILENAME (if it exists). 
  
- Additional parameters in the configuration that are taken from the ENV_FILE
  
- Show questions in Action In editor in the same order in which they are in the 
  workflow 
  
- Configuration of Summernote now precludes the use of drag and drop (Issue #63)

- Preview screen for emails now includes the total number of emails (Issue #64)

### Fixed

- Row dashboard now takes into account the subset of data considered in a view.

- Emails are now sent asynchronously through a queue (Issue #45)
  
- Subject line for emails is now properly processed in the preview it if 
  contains variables like a template (Issue #54)
  
- Fixed incorrect number comparison when providing a range (Issue #49)

- Text in the personalised messages is now processed to remove newlines that 
  break the processing (Issue #44) 
  
- Action out editor no longer allows drag & drop (Issue #25)
  
- Bug when evaluating a condition with the operand "doesn't begin with" (Issue
  #68)
  
- Bug when receiving a large volume of tracking requests (Issue #67)