Adds support for morse code.

• fixes bug concerning special characters #9 (comment)
• adds function to retrieve supported languages for Google Translate
• adds function to validate language codes
• adds package dataset for the supported languages in Google Translate

Adds the functionality to batch translate files

• Adds shiny app
• Adds Apertium methods

Full Changelog: https://github.com/Tomeriko96/polyglotr/commits/latest