Hi Paul,
Here is the French text that needs to be added to the user_profile_basic.html template :

<tr>
<td align=right valign=top>
<%body_font%>
Filtrer les messages des utilsateurs (dans les discussions):<br>
<small>(un utilisateur par ligne)</small>
<%/body_font%>
</td>
<td>
<textarea name=block_user class=button cols="<%user_cols%>" rows="<%user_rows%>" wrap=soft><%if block_user%><%block_user%><%endif%></textarea>
</td>
</tr>

As you can see I have modified the text to inform that it concerns messages in the discussions, since I have also installed your nifty Private Message blocking Plugin and I feel that the two need to be differentiated so as not to confuse users about what and where they are blocking messages.

John

PS : I will post the French one for the PM Blocker just after
Significant Media