Fixed #367 - ids must be raw numbers

...adlocker8/budgetmaster/controller/CategoryController.java

.../de/deadlocker8/budgetmaster/services/HelpersService.java

src/main/resources/templates/accounts/accounts.ftl

src/main/resources/templates/accounts/newAccount.ftl

src/main/resources/templates/categories/categories.ftl

src/main/resources/templates/categories/newCategory.ftl

src/main/resources/templates/import.ftl

src/main/resources/templates/navbar.ftl

src/main/resources/templates/settings.ftl

src/main/resources/templates/transactions/newTransaction.ftl

src/main/resources/templates/transactions/transactions.ftl