Hey guys , i hope you doing fine anyways
its a weird bug with a weird fix
to fix this issue simply
1 - close the game
2 - go to battle.net launcher
3 - click on modify install
4 - then change language
then select multiple language but make sure the default language is english
the shaders will finish within a min and you will be able to get out of the HQ menu
that fix worked for me 
i hope it works for you too