Fix FEM and Material typos

Found via `codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,apoints,ba,beginn,behaviour,bloaded,bottome,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childs,colour,colours,commen,connexion,currenty,dof,doubleclick,dum,eiter,elemente,ende,feld,finde,findf,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,inout,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,ontop,orgin,orginx,orginy,ot,pard,parms,pres,programm,que,recurrance,rougly,seperator,serie,sinc,strack,substraction,te,thist,thru,tread,uint,unter,vertexes,wallthickness,whitespaces -S ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml,./build/doc/SourceDocu`

src/Mod/Material/importFCMat.py

@@ -23,7 +23,7 @@
 
 __title__ = "FreeCAD material card importer"
 __author__ = "Juergen Riegel"
-__url__ = "http://www.freecadweb.org"
+__url__ = "https://www.freecadweb.org"
 
 
 import os
@@ -119,7 +119,7 @@ def read(filename):
         # https://forum.freecadweb.org/viewtopic.php?f=18&t=56912#p489721
         # older FreeCAD do not write utf-8 for special character on windows
         # I have seen "ISO-8859-15" or "windows-1252"
-        # explizit utf-8 writing, https://github.com/FreeCAD/FreeCAD/commit/9a564dd906f
+        # explicit utf-8 writing, https://github.com/FreeCAD/FreeCAD/commit/9a564dd906f
         FreeCAD.Console.PrintError("Error on card loading. File might not utf-8.")
         return {}
     d = {}