client/views: replace fieldsets with divs

Although it has nice semantic name, fieldset gives troubles to flexbox,
so I'm dropping it.

client/css/forms.css

@@ -2,17 +2,6 @@ form {
     display: block;
     width: 20em;
 }
-form fieldset {
-    margin: 0;
-    padding: 0;
-    border: 0;
-}
-form fieldset legend {
-    display: block;
-    text-align: center;
-    width: 100%;
-    font-size: 17pt;
-}
 form ul {
     list-style-type: none;
     margin: 0;
@@ -180,12 +169,12 @@ input[type=password]:focus {
     border-color: var(--main-color);
 }
 
-form.show-validation fieldset.input input:invalid {
+form.show-validation .input input:invalid {
     outline: none;
     border: 2px solid var(--input-bad-border-color);
     background: var(--input-bad-background-color);
 }
-form.show-validation fieldset.input input:valid {
+form.show-validation .input input:valid {
     outline: none;
     border: 2px solid var(--input-good-border-color);
     background: var(--input-good-background-color);

client/html/login.hbs

@@ -1,7 +1,7 @@
 <div class='content-wrapper' id='login'>
     <h1>Log in</h1>
     <form>
-        <fieldset class='input'>
+        <div class='input'>
             <ul>
                 <li>
                     <label for='user-name'>User name</label>
@@ -16,13 +16,13 @@
                     <label for='remember-user' class='checkbox'>Remember me</label>
                 </li>
             </ul>
-        </fieldset>
-        <fieldset class='messages'></fieldset>
-        <fieldset class='buttons'>
+        </div>
+        <div class='messages'></div>
+        <div class='buttons'>
             <input type='submit' value='Log in'/>
             {{#if this.canSendMails}}
                 <a href='/password-reset'>Forgot the password?</a>
             {{/if}}
-        </fieldset>
+        </div>
     </form>
 </div>

client/html/password_reset.hbs

@@ -1,20 +1,20 @@
 <div class='content-wrapper' id='password-reset'>
     <h1>Password reset</h1>
     <form autocomplete='off'>
-        <fieldset class='input'>
+        <div class='input'>
             <ul>
                 <li>
                     <label for='user-name'>User name or e-mail address</label>
                     <input id='user-name' name='user-name' type='text' autocomplete='off' required/>
                 </li>
             </ul>
-        </fieldset>
+        </div>
         <p><small>Proceeding will send an e-mail that contains a password reset
         link. Clicking it is going to generate a new password for your account.
         It is recommended to change that password to something else.</small></p>
-        <fieldset class='messages'></fieldset>
-        <fieldset class='buttons'>
+        <div class='messages'></div>
+        <div class='buttons'>
             <input type='submit' value='Proceed'/>
-        </fieldset>
+        </div>
     </form>
 </div>

client/html/user_deletion.hbs

@@ -1,6 +1,6 @@
 <div id='user-delete'>
     <form>
-        <fieldset class='input'>
+        <div class='input'>
             <ul>
                 <li>
                     <input id='confirm-deletion' name='confirm-deletion' type='checkbox' required/>
@@ -9,10 +9,10 @@
                     </label>
                 </li>
             </ul>
-        </fieldset>
-        <fieldset class='messages'></fieldset>
-        <fieldset class='buttons'>
+        </div>
+        <div class='messages'></div>
+        <div class='buttons'>
             <input type='submit' value='Delete account'/>
-        </fieldset>
+        </div>
     </form>
 </div>

client/html/user_edit.hbs

@@ -1,6 +1,6 @@
 <div id='user-edit'>
     <form class='tabular'>
-        <fieldset class='input'>
+        <div class='input'>
             <ul>
                 {{#if this.canEditName}}
                     <li>
@@ -35,10 +35,10 @@
                 {{/if}}
             </ul>
             <!-- TODO: avatar -->
-        </fieldset>
-        <fieldset class='messages'></fieldset>
-        <fieldset class='buttons'>
+        </div>
+        <div class='messages'></div>
+        <div class='buttons'>
             <input type='submit' value='Save settings'/>
-        </fieldset>
+        </div>
     </form>
 </div>

client/html/user_registration.hbs

@@ -1,7 +1,7 @@
 <div class='content-wrapper' id='user-registration'>
     <h1>Registration</h1>
     <form autocomplete='off'>
-        <fieldset class='input'>
+        <div class='input'>
             <ul>
                 <li>
                     <label for='user-name'>User name</label>
@@ -17,11 +17,11 @@
                     <p class='hint'>Used for password reminder and to show a <a href='http://gravatar.com/'>Gravatar</a>. Leave blank for random Gravatar.</p>
                 </li>
             </ul>
-        </fieldset>
-        <fieldset class='messages'></fieldset>
-        <fieldset class='buttons'>
+        </div>
+        <div class='messages'></div>
+        <div class='buttons'>
             <input type='submit' value='Create an account'/>
-        </fieldset>
+        </div>
     </form>
     <div class='info'>
         <p>Registered users can:</p>