Fix various typos + translate some comments to EN
    
    Found via `codespell -q 3 -S *.ts,thirdparty,./toonz/sources/common/twain -L appy,ba,chunck,datas,forse,inbetween,inly,inout,pevent,possibile,strack,upto,vertexes`
    Follow-up to PR #4156
    Closes #4072  
    Revert hidden unicode commit made by git client