The conhelp_<locale_name>.php file should not contain HTML-specific tags (for instance é). The best way is not to use them at all.
The translation should be in the text file, not MS WORD.
To speed up language pack release, we highly recommend paying attention to preserving consistency in the button names and selection elements (checkboxes, radio-buttons, etc.) in the help files, conhelp_<locale_name>.php and messages_<locale_name>.php. For instance, the button entitled Esqueleto should be entitled the same way in the help file.
To avoid layout problems with interface, it is recommended to match the translated string length with the original one.
The PHP files entries sometimes contain constructions like %1 representing variables. Those should be inserted into a proper (by context) place.
Creation of installable language pack.