Features:
* Added Danish translations (aa548cbf, 75fbe12f) @mondstern
* Added French translations (854c836e) @twann
* Added Spanish translations (e8742dc4) @XabMS
* Added Dutch translations (0fd9fc4b) @mondstern
* Added German translations (468a32de) @mondstern

Bug fixes:
* Exercise list is now sorted in a case-insensitive manner (ec863c83) @yamanq

Development:
* Upgraded dependencies (2d966e3c, b4918d3e, 3ae85e56, 1881c369)
