v1.15.0

• Fix some issues with conversion of trade code term and unit rules
• CITES suspension history now shows end notification where available
• Fix a frontend bug in the downloads, where a dropdown value was being used
  in the request, even when the dropdown was not being displayed.
• Fix to the admin area to ensure non-Latin letters aren't being entered into
  certain fields which are used for PDFs, where pdflatex does not know how
  to handle them.
• Fix for the CITES Checklist, which was showing "this taxon is split-listed"
  in some cases where this was not true.
• Replace feedback modal