fix: add permissions and function formatting updates

Updates to several files:

• addTransaction.php: The permission check has been evolved to include 'quiqqer.paymentTransactions.create'.
• Panel.js: Function spaces have been changed following JavaScript convention for anonymous function display (function () instead of function()).
• locale.xml: Locale names were changed to represent transactions instead of payments. Also, two new set of permissions: create and view transactions are added to the locales file.
• menu.xml: quiqqer.paymentTransactions.view permission is added to the menu.