[DDW-317] Font display improvements

[nikolaglumac]

This PR improves text display by reducing letter-spacing.

Since a new NotoSans font was introduced we need to slightly modify the letter-spacing in order to make the new font look more compact and to save space.
We need to do the following:

• remove global body CSS letter-spacing: 1px rule
• change Dialog title CSS letter-spacing from 2px to 1px
• add word-spacing: 2px to Mnemonics box on both Wallet create and Paper wallet create dialogs

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Review Checklist:

Basics

• PR is updated to the most recent version of target branch (and there are no conflicts)
• PR has good description that summarizes all changes and shows some screenshots or animated GIFs of important UI changes
• CHANGELOG entry has been added and is linked to the correct PR on GitHub
• Automated tests: All acceptance tests are passing (npm run test)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in development build (npm run dev)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in production build (npm run package / CI builds)
• There are no flow errors or warnings (npm run flow:test)
• There are no lint errors or warnings (npm run lint)
• Text changes are proofread and approved (Jane Wild)
• There are no missing translations (running npm run manage:translations produces no changes)
• UI changes look good in all themes (Alexander Rukin)
• Storybook works and no stories are broken (npm run storybook)
• In case of npm dependency changes both package-lock.json and yarn.lock files are updated

Code Quality

• Important parts of the code are properly documented and commented
• Code is properly typed with flow
• React components are split-up enough to avoid unnecessary re-rendering
• Any code that only works in Electron is neatly separated from components

Testing

• New feature / change is covered by acceptance tests
• All existing acceptance tests are still up-to-date
• New feature / change is covered by Daedalus Testing scenario
• All existing Daedalus Testing scenarios are still up-to-date

After Review:

• Merge PR
• Delete source branch
• Move ticket to done on the Youtrack board

[alexander-rukin]

OK