feat(ui): All components to use SASS variable for font size #17264

[ekamphuis82]

Resolves #17264

What kind of change does this PR introduce?

• Feature

Does this PR introduce a breaking change?

• No

The PR fulfills these requirements:

• It's submitted to the dev branch (or v[X] branch)
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• It's been tested on a Cordova (iOS, Android) app
• It's been tested on an Electron app
• Any necessary documentation has been added or updated in the docs or explained in the PR's description.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to start a new feature discussion first and wait for approval before working on it)

Other information:

[mstroeve]

@yusufkandemir as this is our first PR in this project can you give us feedback regarding the correct usage of guide lines in this PR?

[yusufkandemir]

@mstroeve with a broad look, things look fine. We will need to review it to ensure it's ready to get merged. We couldn't find enough time to review it, yet. Thanks for your understanding and the contribution.