French doc updates 2021-05-20

Jacques Chion continues plugging away at it! :-D

docs/fr_FR.UTF-8/html/README.html

@@ -239,7 +239,7 @@
             noshade>
 
         <h3>
-          macOS Users        </h3>
+          Utilisateurs de macOS        </h3>
 
         <blockquote>
           <p>
@@ -1025,7 +1025,7 @@
 
                 <dd>
                   <p>
-                    <em>(Linux and Unix only)</em>
+                    <em>(Linux et Unix uniquement)</em>
                   </p>
 
                   <p>
@@ -1387,7 +1387,7 @@
 
         <li>
           <a href="../../CHANGES.txt">CHANGES.txt</a><br>
-          Résumé des changements entre chaque version de Tux Paint        </li>
+          Résumé des changements entre chaque version de Tux Paint.        </li>
 
         <li>
           <a href="../../COPYING.txt">COPYING.txt</a><br>

docs/fr_FR.UTF-8/html/SIGNALS.html

@@ -50,7 +50,7 @@
           <b>Note:</b> From other parts of the interface, the signal is currently interpreted as a request to go back (e.g., from the "New" dialog back to the main interface), as if a "Back" button in Tux Paint were clicked, or the <b><code>[Esc]</code></b> was key pressed.        </p>
 
         <p>
-          Example: <code>killall tuxpaint</code>        </p>
+          Exemple: <code>killall tuxpaint</code>        </p>
       </dd>
 
       <dt>
@@ -68,7 +68,7 @@
           <b>Note:</b> From other parts of the interface, unfortunately, Tux Paint will go back one level in the interface.  Therefore, at this time, it may be necessary to send this signal to Tux Paint a few times, for it to quit completely.        </p>
 
         <p>
-          Example: <code>killall -s SIGUSR1 tuxpaint</code>        </p>
+          Exemple: <code>killall -s SIGUSR1 tuxpaint</code>        </p>
       </dd>
     </dl>
   </body>