Add i18n translations for page content (Home, Database, Logs)

Extended internationalization support by adding translation keys and data-i18n attributes to page content. Previously only the sidebar was translated - now the main content of Home, Database, and Logs pages will switch between French and English when the user changes the language selector.

Translation keys added:
- Home page: title, welcome message, PM measures, Linux stats, disk/memory usage
- Database page: all UI labels, buttons, and dropdown options
- Logs page: title, description, log types, and action buttons

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

html/logs.html

@@ -49,30 +49,30 @@
         </aside>
       <!-- Main content -->
       <main class="col-md-10 ms-sm-auto col-lg-11 offset-md-2 offset-lg-1 px-md-4">
-        <h1 class="mt-4">Le journal</h1>
-        <p>Le journal des logs permet de savoir si les processus du capteur se déroulent correctement.</p>
+        <h1 class="mt-4" data-i18n="logs.title">Le journal</h1>
+        <p data-i18n="logs.description">Le journal des logs permet de savoir si les processus du capteur se déroulent correctement.</p>
         <div class="row">
           <!-- card 1 -->
           <div class="col-lg-6 col-12">
             <div class="card" style="height: 80vh;">
               <div class="card-header">
-                Sara logs  
-                <button type="submit" class="btn btn-secondary btn-sm" id="refresh-master-log">Refresh</button>
-                <button type="submit" class="btn btn-secondary btn-sm" onclick="clear_loopLogs()">Clear</button>
+                <span data-i18n="logs.saraLogs">Sara logs</span>
+                <button type="submit" class="btn btn-secondary btn-sm" id="refresh-master-log" data-i18n="logs.refresh">Refresh</button>
+                <button type="submit" class="btn btn-secondary btn-sm" onclick="clear_loopLogs()" data-i18n="logs.clear">Clear</button>
 
                   <span id="script_running"></span>
               </div>
               <div class="card-body overflow-auto" id="card_loop_content">
 
-              </div> 
+              </div>
             </div>
           </div>
           <!-- card 2 -->
           <div class="col-lg-6 col-12">
             <div class="card" style="height: 80vh;">
               <div class="card-header">
-                Boot logs
-                <button type="submit" class="btn btn-secondary btn-sm" id="refresh-boot-log">Refresh</button>
+                <span data-i18n="logs.bootLogs">Boot logs</span>
+                <button type="submit" class="btn btn-secondary btn-sm" id="refresh-boot-log" data-i18n="logs.refresh">Refresh</button>
               </div>
               <div class="card-body overflow-auto" id="card_boot_content">