Fixed #542 - new transaction: allow date input without using the graphical datepicker

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

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

src/main/resources/languages/base_de.properties

src/main/resources/languages/base_en.properties

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

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