Misc. comment typos

+ Found via `codespell -q 3 --skip="*.po,*.ts,./.git,./src/3rdParty,./src/CXX,./src/zipios++,./src/Mod/Assembly/App/opendcm" -I ~/Projects/fc-word-whitelist.txt`

+ crowdin translation refinements:  
- https://crowdin.com/translate/freecad/6766/en-en#6499546
- https://crowdin.com/translate/freecad/6766/en-en#6504496

src/Mod/Arch/ArchSectionPlane.py

@@ -407,7 +407,7 @@ class _SectionPlane:
         if not "Shape" in pl:
             obj.addProperty("Part::PropertyPartShape","Shape","SectionPlane",QT_TRANSLATE_NOOP("App::Property","The shape of this object"))
         if not "Objects" in pl:
-            obj.addProperty("App::PropertyLinkList","Objects","SectionPlane",QT_TRANSLATE_NOOP("App::Property","The objects that must be considered by this section plane. Empty means all document"))
+            obj.addProperty("App::PropertyLinkList","Objects","SectionPlane",QT_TRANSLATE_NOOP("App::Property","The objects that must be considered by this section plane. Empty means the whole document."))
         if not "OnlySolids" in pl:
             obj.addProperty("App::PropertyBool","OnlySolids","SectionPlane",QT_TRANSLATE_NOOP("App::Property","If false, non-solids will be cut too, with possible wrong results."))
             obj.OnlySolids = True

src/Mod/Arch/importOBJ.py

@@ -185,8 +185,8 @@ def export(exportList,filename):
                     for f in flist:
                         outfile.write("f" + f + "\n")
     outfile.close()
-    FreeCAD.Console.PrintMessage(translate("Arch","Successfully written ").decode('utf8') + filename + "\n")
-    if materials:
+    FreeCAD.Console.PrintMessage(translate("Arch","Successfully written").decode('utf8') + " " + filename + "\n")
+    if materials: 
         outfile = pythonopen(filenamemtl,"wb")
         outfile.write("# FreeCAD v" + ver[0] + "." + ver[1] + " build" + ver[2] + " Arch module\n")
         outfile.write("# http://www.freecadweb.org\n")