use let instead of var

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

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

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

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

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

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

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

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

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

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

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

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