#677 - move keyword check to own controller + pass transaction name

...ker8/budgetmaster/transactions/TransactionController.java

...ansactions/keywords/TransactionNameKeywordController.java

.../transactions/keywords/TransactionNameKeywordService.java

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

...MasterServer/src/main/resources/static/js/transactions.js

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

...resources/templates/transactions/newTransactionMacros.ftl

...lates/transactions/transactionNameKeywordWarningModal.ftl