PropertiesBasedTranslationSupplier()
A base class for properties based TranslationSuppliers which provides a loading and caching mechanism of properties files.
There is no way to purge the cache. This class is intended for a one run process where translations do not change in between.
It is compatible with Java's Properties - thus properties files should also use ISO-8859-1 as encoding.
T - Translations are grouped by a certain aspect (for instance, by Locale). T defines the type of it.