To fix issue caused by #3071
In order to still fulfill the new linter rule `import/order`, I replaced
the alias with the path.
I also see two other approaches, but I opted for the simplest one here
for now.
The other approaches:
1. Also create an alias for `app`.
2. Use new `imports` (like in PR #2934), but let `_moduleAliases`
untouched to stay compatible to 3rd party modules.
**Edit**: Oh, I thought of another option:
- Add `require("module-alias/register");`
- order (external first)
- remove superfluous file extensions
- new line after imports
- deconstruct (only one time (in `check_config.js`))
- fix path (only one time (in `global-setup.js`))
We have used it inconsistently till now. Template literals are more
modern and easier to maintain in my opinion.
Because that's a large amount of changes, here's a way to reproduce it:
I added the rule `"prefer-template": "error"` to the `.eslintrc.json`
and did an autofix. Since this caused a new problem in line 409 of
`newsfeed.js`, I reversed it in that line and also removed the rule from
the eslint config file.
The rule is described here:
https://eslint.org/docs/latest/rules/prefer-template
Note: I've played around with some other linter rules as well, and some
seem to point to some specific, non-cosmetic, issues. But before I dive
even deeper and then introduce even bigger and hardly understandable
changes at once, I thought I'd start with this simple cosmetic rule.
