Fixed #376 - tomcat compatibility

pom.xml

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

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

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/datePicker.ftl

src/main/resources/templates/error/403.ftl

src/main/resources/templates/error/404.ftl

src/main/resources/templates/error/418.ftl

src/main/resources/templates/error/500.ftl

src/main/resources/templates/header.ftl

src/main/resources/templates/import.ftl

src/main/resources/templates/index.ftl

src/main/resources/templates/login.ftl

src/main/resources/templates/navbar.ftl

src/main/resources/templates/scripts.ftl

src/main/resources/templates/settings.ftl

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