#79 i18n fallback strategy

[Donat Mueller]

The properties filename fallback strategy is now simple hardcoded lookup for

• baseName<language>_<region>.properties</region></language>
• baseName<language>.properties</language>
• baseName.properties

The correct implementation takes any baseName<language>*.properties file for the second level instead of a generic file per language.</language>

Test
i18n test with locale de_CH produces en text instead of using the de_DE file.