[Tool] Translate helper

[Mouchi]

I have published a Steam guide to be clearer than the presentation thread and updated to the new content.

Changelog since the EUIV/HoI4/Stellaris compatibility (January 2018) :

Spoiler

2.5 (July 2018)
# Features
- Manage version number for EUIV/HoI4/Stellaris
- Add a go to line button in translation interface
# Fixes
- Split open file right-click action into open source and open destination file to support EUIV/HoI4/Stellaris

2.4 (May 2018)
# Features
- Add buttons to restore the original source or destination text
- Add a button to copy source text into destination
# Fixes
- Fix error when using Previous button with CK2 files
- Refresh the diagnostic after checking a file
- Ask to save before leaving the Translate Helper

2.3 (March 2018)
# Features
- Add a copy translation button
- Add keyboard shortcuts for translation actions
# Fixes
- Refresh action reloads now the current working session instead of the first loaded
- Stop duplicate text when saving several times missing text
- Avoid to lose translation when creating a file with the Translate Helper

2.2 (February 2018)
# Fixes
- Increase window width
- Fix issue when localization directory is deleted

2.1 (January 2018)
# Fixes
- Check all lines action don't crash for EUIV/HoI4/Stellaris
- Missing saving for line number greater than the number of line in the file for EUIV/HoI4/Stellaris
- Do not count a line without source as not translated

Suggestion: Hotkey for the options, as well as for Copy the Source and Paste to Translation.

Thank you for the suggestion, it has been implemented since the 2.3 version (March 2018)