- removed vi-vn locale because no one translate it
- added 6 new splash screen messages
- encoded file names for discord rpc icons
- made preparations for env manager
- improved `Window` class. Added:
+ `Window.isWayland()` to check if the system runs under wayland
+ `Window.upscaleSize()` to fix sizing of the window if the system uses wayland
- removed ability to resize windows (mistakenly added in the prev commit)
- Discord RPC icons were moved to `src/assets/images/discord` folder
and highly optimized
- added templates for `fr-fr`, `es-es` and `vi-vn` translations
- added Discord RPC icons selection
- added windows centering;
also added `Window.current.center()` method
