#4: Added language files
#4: Added topic and topic translations
Merge branch 'develop' into feature/#4-topic-drinking

Conflicts:
	src/be/webfactor/polyglot/domain/Topic.java
	src/be/webfactor/polyglot/exercises/Language_de.properties
	src/be/webfactor/polyglot/exercises/Language_en.properties
	src/be/webfactor/polyglot/exercises/Language_es.properties
	src/be/webfactor/polyglot/exercises/Language_fr.properties
	src/be/webfactor/polyglot/exercises/Language_nl.properties
#4: Added translations
Merge branch 'feature/#4-topic-drinking' into develop