[REF] web: Update generic files

General cleaning of some helpers and generic files. The idea is that they are
less likely to be entirely re-written in the near future so this is a way to
keep the code clean, readable and compliant to the current standards. Changes include:
- Use of async/await when possible
- Use of const/let instead of var
- Removal of underscore.js
- Use of native JS instead of jQuery when possible

The logic of the affected code remains the same.

0 files changed, 0 insertions, 0 deletions