fix: Fix Fether menu German language translation after review from @Robbepop (native German speaker)

index.js:1446 Warning: App has a method called componentDidUnmount(). But there is no such lifecycle method. Did you mean componentWillUnmount()?

* fix: Fixes #459. Use default role for Edit menu on macOS

* refactor: Remove double quotes

* refactor: Try fix linting so single quote and not complain no-sparse-arrays

fix: Fixes #453. Show window if visible but blurred

docs: Update Readme with dependencies, guide for taskbar usage and building and debugging production

Merge pull request #440 from paritytech/luke-refactor-menu-and-no-close-minimise-window-for-taskbar-app

refactor: Update Fether menu for taskbar mode on non-macOS (add 'Quit', remove 'Close Window', remove 'Minimize') 

Fixed window size

fix: Fixes #421. Linux tray and dock icon not pixelated and Fether branding