#626 - added new entity "hint"

src/main/java/de/deadlocker8/budgetmaster/Main.java

src/main/java/de/deadlocker8/budgetmaster/hints/Hint.java

...ava/de/deadlocker8/budgetmaster/hints/HintController.java

...ava/de/deadlocker8/budgetmaster/hints/HintRepository.java

...n/java/de/deadlocker8/budgetmaster/hints/HintService.java

...eadlocker8/budgetmaster/services/LocalizationService.java

...main/java/de/deadlocker8/budgetmaster/utils/Mappings.java

src/main/resources/languages/hints_de.properties

src/main/resources/languages/hints_en.properties

...ocker8/budgetmaster/unit/helpers/LocalizationHelpers.java