IMPR: Better color management to support themed css

[a2nt]

Current color theme is Catpuchin Mocha

An example to switch light/dark included at src/scss/global/colours_theme.scss:

$red-light-bg: darken($red, 20%);
$turquoise-light-bg: darken($turquoise, 20%);

.light-theme {
  --color-red: #{$red-light-bg};
  --color-turquoise: #{$turquoise-light-bg};
}

.dark-theme {
  --color-mid_grey: #{$subtext1};
}

A color theme can be imported at src/scss/global/colours.scss For example:
@import "mocha";

[jaedb]

Nice work! It looks like you've got some other changes in this PR not related to the theme changes you've been working on. Can you please split this out? PRs should be (reasonably) self-contained bodies of work - that makes it a great deal easier to review, patch and schedule for release.

[a2nt]

There's also locale update I can remove it. Some other css changes comes up from automatic linter, but looks like default project linter doesn't works properly

npm lint:fix
/home/tony/Downloads/Software/Iris/src/js/App.js
  0:0  error  Parsing error: require() of ES Module /home/tony/Downloads/Software/Iris/node_modules/.pnpm/eslint-scope@7.1.1/node_modules/eslint-scope/lib/definition.js from /home/tony/Downloads/Software/Iris/node_modules/.pnpm/babel-eslint@10.1.0_eslint@8.19.0/node_modules/babel-eslint/lib/require-from-eslint.js not supported.
Instead change the require of definition.js in /home/tony/Downloads/Software/Iris/node_modules/.pnpm/babel-eslint@10.1.0_eslint@8.19.0/node_modules/babel-eslint/lib/require-from-eslint.js to a dynamic import() which is available in all CommonJS modules