Refactor code for improved readability and consistency in multiple files

connexion.php

@@ -27,11 +27,15 @@ if (@$infos_user['token'] == @$_SESSION['token'] && @$_SESSION['token'] != '') {
 ?>
 	<h2>Connexion</h2>
 	<form method="post">
-		Utilisateur :<br />
-		<input type="text" name="user"><br /><br />
-		Mot de passe :<br />
-		<input type="password" name="pass">
-		<input type="submit" value="Se connecter">
+		<div class="mb-3">
+			<label for="username" class="form-label">Utilisateur :</label>
+			<input type="text" name="user" class="form-control" id="username">
+		</div>
+		<div class="mb-3">
+			<label for="password" class="form-label">Mot de passe :</label>
+			<input type="password" name="pass" class="form-control" id="password">
+		</div>
+		<input type="submit" value="Se connecter" class="btn btn-primary">
 	</form>
 <?php
 }