abstract fun newPropertiesBasedTranslationSupplier(): TranslationSupplierCreates a TranslationSupplier which is based on properties and is compatible with ResourceBundle concerning the structure of the properties files.
For instance, the translations for ch.tutteli.atrium.DescriptionAnyAssertion and the Locale de_CH are
stored in a properties file named DescriptionAnyAssertion_de_CH.properties in the folder /ch/tutteli/atrium/.
Moreover the files need to be encoded in ISO-8859-1 (restriction to be compatible with ResourceBundle).
An entry in such a file would look like as follows:
TO_BE = a translation for TO_BE
Return
The newly created translation supplier.