Fix typos found in plugins/ directory
Found via codespell -q 3 -S *.svg,*.desktop,*.xpm,./plugins/textediting/autocorrection,./plugins/textediting/thesaurus -L ba,blok,childs,currenty,fo,libray,parm,parms,readed,ser,som,uptodate,vektor,vertexes
Found via codespell -q 3 -S *.svg,*.desktop,*.xpm,./plugins/textediting/autocorrection,./plugins/textediting/thesaurus -L ba,blok,childs,currenty,fo,libray,parm,parms,readed,ser,som,uptodate,vektor,vertexes