Crowdin: Removing whitespace from widgets

Modified the code so that the whitespace was hardcoded since translators on Crowdin weren't adding the whitespace. Please review if correct. 
+ found some other typos/grammar issues along the way. 
CC @yorikvanhavre

src/Mod/Arch/importJSON.py

@@ -55,7 +55,7 @@ def export(exportList, filename):
 
     # Success
     FreeCAD.Console.PrintMessage(
-        translate("Arch", "successfully written ") + filename + "\n")
+        translate("Arch", "successfully written") + ' ' + filename + "\n")
 
 
 def getObjectData(obj):