#411 - added backup reminder modal to all pages

.../deadlocker8/budgetmaster/accounts/AccountController.java

...adlocker8/budgetmaster/categories/CategoryController.java

.../deadlocker8/budgetmaster/controller/AboutController.java

...dlocker8/budgetmaster/controller/EmptyPageController.java

...de/deadlocker8/budgetmaster/reports/ReportController.java

...deadlocker8/budgetmaster/settings/SettingsController.java

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

src/main/resources/templates/about.ftl

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/helpers/navbar.ftl

src/main/resources/templates/index.ftl

src/main/resources/templates/placeholder/comingSoon.ftl

src/main/resources/templates/placeholder/emptyPage.ftl

src/main/resources/templates/reports/reports.ftl

src/main/resources/templates/settings/import.ftl

src/main/resources/templates/settings/settings.ftl

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