Fix misc. typos

Found via 
```codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,apoints,ba,beginn,behaviour,bloaded,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,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,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/StandardMaterial/Graphite.FCMat

@@ -9,7 +9,7 @@ Name = Graphite
 Description = Typical material properties for pure graphite
 Father = Carbon
 KindOfMaterial = Solid
-ReferenceSource = Poperties and characteristics of graphite
+ReferenceSource = Properties and characteristics of graphite
 SourceURL = https://www.entegris.com/content/dam/web/resources/manuals-and-guides/manual-properties-and-characteristics-of-graphite-109441.pdf
 
 [Mechanical]

src/Mod/Path/PathScripts/PathPocketShape.py

@@ -192,7 +192,7 @@ class Extension(object):
     def getExtensionFaces(self, extensionWire):
         '''getExtensionFace(extensionWire)...
         A public helper method to retrieve the requested extension as a face,
-        rather than a wire becuase some extensions require a face shape
+        rather than a wire because some extensions require a face shape
         for definition that allows for two wires for boundary definition.
         '''
 

src/Mod/Path/PathScripts/PathPocketShapeGui.py

@@ -75,7 +75,7 @@ class _Extension(object):
         hnt = coin.SoShapeHints()
 
         if not ext is None:
-            numVert = list()  # track number of verticies in each polygon face
+            numVert = list()  # track number of vertices in each polygon face
             try:
                 wire =  ext.getWire()
             except FreeCAD.Base.FreeCADError:

src/Mod/Path/PathScripts/post/philips_post.py

@@ -20,7 +20,7 @@
 #*                                                                         *
 #***************************************************************************
 
-# 03-24-2021  Sliptonic:  I've removed teh PathUtils import and job lookup
+# 03-24-2021  Sliptonic:  I've removed the PathUtils import and job lookup
 # post processors shouldn't be reaching back to the job.  This can cause a
 # proxy error.
 

src/Tools/updatecrowdin.py

@@ -253,7 +253,7 @@ if __name__ == "__main__":
         main_ts_files = list(filter(lambda f: not [a for a in ts_files_wo_ext if a in f and f != a], ts_files_wo_ext))
         # Create tuples to map Crowdin name with local path name
         names_and_path = [(f'{basename(f)}.ts', f'{f}.ts') for f in main_ts_files]
-        # Accomodate for legacy naming
+        # Accommodate for legacy naming
         ts_files = [TsFile(LEGACY_NAMING_MAP[a] if a in LEGACY_NAMING_MAP else a, b) for (a, b) in names_and_path]
 
         updater.update(ts_files)