fix error messages

dq8chr2glb/ChrFile.cs

@@ -191,7 +191,7 @@ public class ChrFile
         }
         catch (Exception e)
         {
-            Context.current.errors.Add(new Error(file.name, "Error then process text file", e));
+            Context.current.errors.Add(new Error(file.name, "Error while process text file", e));
         }
     }
 

dq8chr2glb/TM2Format/TM2Format.cs

@@ -73,7 +73,7 @@ public static class TM2Format
         }
         catch (Exception e)
         {
-            Context.current.errors.Add(new Error(currentFile.name, "Error then import texture", e));
+            Context.current.errors.Add(new Error(currentFile.name, "Error while import texture", e));
             palette = null;
         }