Material: fix typos

Found via codespell
Thought this would merit a pre-0.18 release commit because of `./src/Mod/Material/StandardMaterial/TEMPLATE.FCMat`

src/Mod/Material/Material.py

@@ -49,7 +49,7 @@
 """
 
 
-# see comments in module importFCMat, there is a independent parser implementaion for reading and writing FCMat files
+# see comments in module importFCMat, there is an independent parser implementation for reading and writing FCMat files
 # inside FreeCAD a mixture of these parsers and the ones in importFCMat.py is used
 
 

src/Mod/Material/StandardMaterial/TEMPLATE.FCMat

@@ -5,7 +5,7 @@
 
 ; localized Name, Description and KindOfMaterial uses 2 letter codes
 ; defined in ISO-639-1, see https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
-; find unit informations in src/App/FreeCADInit.py
+; find unit information in src/App/FreeCADInit.py
 
 [General]
 ; General name

src/Mod/Material/importFCMat.py

@@ -84,12 +84,12 @@ def decode(name):
 # https://en.wikipedia.org/wiki/INI_file
 # http://www.docuxplorer.com/WebHelp/INI_File_Format.htm
 # mainly this parser here is used in FreeCAD
-# in the module Material.py is another implementaion of reading and writing FCMat files which uses the module ConfigParser
+# in the module Material.py is another implementation of reading and writing FCMat files which uses the module ConfigParser
 # in ViewProviderFemMaterial in add_cards_from_a_dir() the parser from Material.py is used
 # since this mixture seams to be there for ages it should not be changed for 0.18
 # TODO: get rid of this mixture in FreeCAD 0.19
 
-# Metainformations
+# Metainformation
 # first five lines are the same in any card file
 # Line1: card name
 # Line2: author and licence
@@ -124,11 +124,11 @@ def read(filename):
                 v = v.decode('utf-8')
             d["AuthorAndLicense"] = v
         else:
-            # ; is a Commend
+            # ; is a Comment
             # # might be a comment too ?
             # [ is a Section
             if line[0] not in ";#[":
-                k = line.split("=", 1)  # only split once on first occurence, a link could contain a = and thus would be splitted
+                k = line.split("=", 1)  # only split once on first occurrence, a link could contain a = and thus would be splitted
                 if len(k) == 2:
                     v = k[1].strip()
                     if hasattr(v, "decode"):