A nice function to add would be custom file format, I for example use a modified java .properties file without spaces, so it would be a convenience to be able to specify the format for loading terms and exporting languages.

It could be a simple project setting that could look like:

{term}={translation}\n

which would essentially be a .properties without spaces. Other keywords could be {context}, {definition}, {reference} and anything else the system can process.

This idea could be expanded, here are some more ideas that could be perhaps worth considering although they aren't as important:

• "User formats", which would be a page where users could paste their file formats for others to use.

• Optional keywords - people could put their keyword or text into square brackets. For example:
  {term} = {value} [# {definition}]\n
  This would accept both of the following lines:
  button.cancel = Cancel
  button.cancel = Cancel # Text on a dialog button

• Ability to mark empty lines to keep the output files clean (or make the system remember placement empty lines inside the imported file)