fixes #2345 create piwigo standard pages

create new theme standard pages with tpl, css, js and images
update backend to handle pages
add config use_standard_pages
on update set config to false, on install set config to true
add standard pages to no be ingored in git

themes/standard_pages/template/register.tpl

@@ -0,0 +1,117 @@
+{combine_css id='identification_register' path="themes/standard_pages/css/identification_register.css" order=100}
+{combine_css path="themes/default/vendor/fontello/css/gallery-icon.css" order=-10}
+
+<script>
+  var selected_language = `{$language_options[$current_language]}`;
+  var url_logo_light = `{$ROOT_URL}themes/standard_pages/images/piwigo_logo.svg`;
+  var url_logo_dark = `{$ROOT_URL}themes/standard_pages/images/piwigo_logo_dark.svg`;
+</script>
+{combine_script id='identification_register' load='async' require='jquery' path='themes/standard_pages/js/identification_register.js'}
+
+<container id="mode" class="light">
+
+  <section id="header-options">
+  <div>
+    <i class="gallery-icon-moon toggle-mode" id="toggle_mode_light" onclick="toggle_mode('dark')"></i>
+    <i class="gallery-icon-sun toggle-mode" id="toggle_mode_dark" onclick="toggle_mode('light')"></i>
+  </div>
+    <div>
+      <a href="{$HELP_LINK}" target="_blank">{'Help'|translate}</a>
+{if isset($errors['register_page_error'])}
+      <div class="error_block_container">
+  {foreach from=$errors['register_page_error'] item=error}
+        <div class="error_block"> 
+          <i class="gallery-icon-cancel"></i>
+          <p>{$error}</p>
+        </div>
+  {/foreach}
+      </div>
+{/if}
+  </section>
+
+  <section id="logo-section">
+    <img id="piwigo-logo" src="{$ROOT_URL}themes/standard_pages/images/piwigo_logo.svg">
+  </section>
+
+
+  <section id="register-form">
+    <div class="">
+      <h1 class="">
+        {'Create an account'|translate}
+      </h1>
+        
+      <form class="properties" method="post" action="{$F_ACTION}" name="register_form" autocomplete="off">
+
+        <div class="column-flex">
+          <label for="mail_address">{'Email address'|translate}</label>
+          <div class="row-flex input-container">
+            <i class="gallery-icon-user-2"></i>
+            <input type="email" name="mail_address" id="login" value="{$F_EMAIL}">
+          </div>
+          <p class="error-message"><i class="gallery-icon-attention-circled"></i> {'must not be empty'|translate}</p>
+        </div>
+
+        <div class="column-flex">
+          <label for="username">{'Username'|translate}</label>
+          <div class="row-flex input-container">
+            <i class="gallery-icon-user-2"></i>
+            <input type="text" name="login" id="login" value="{$F_LOGIN}">
+          </div>
+          <p class="error-message"><i class="gallery-icon-attention-circled"></i> {'must not be empty'|translate}</p>
+        </div>
+
+        <div class="column-flex">
+          <label for="password">{'Password'|translate}</label>
+          <div class="row-flex input-container">
+            <i class="gallery-icon-lock"></i>
+            <input type="password" class="" name="password" id="password" size="25">
+            <i class="gallery-icon-eye togglePassword"></i>
+          </div>
+          <p class="error-message"><i class="gallery-icon-attention-circled"></i> {'must not be empty'|translate}</p>
+        </div>
+
+        <div class="column-flex">
+          <label for="password">{'Confirm Password'|translate}</label>
+          <div class="row-flex input-container">
+            <i class="gallery-icon-lock"></i>
+            <input type="password" class="" name="password_conf" id="password_conf" size="25">
+            <i class="gallery-icon-eye togglePassword"></i>
+          </div>
+          <p class="error-message"><i class="gallery-icon-attention-circled"></i> {'must not be empty'|translate}</p>
+        </div>
+
+        <div class="column-flex">
+          <input type="hidden" name="key" value="{$F_KEY}" >
+          <input tabindex="4" type="submit" name="submit" value="{'Register'|translate}" class="btn btn-main ">
+{if isset($errors['register_form_error'])}
+            <p class="error-message" style="display:block;bottom:-20px;"><i class="gallery-icon-attention-circled"></i> {$errors['register_form_error']}</p>
+{/if}
+        </div>
+      </form>
+
+      <div class="secondary-links">
+        <p>{'Already have an account ?'|translate} <a href="identification.php" title="{'Login'|translate}">{'Login'|translate}</a></p>
+      </div>
+            
+    </div>
+  </section>
+
+  <a href="index.php" id="return-to-gallery"><i class="gallery-icon-left"></i> {'Return to the gallery'|translate}</a>
+
+{if count($language_options) > 1}
+  <section id="language-switch">
+    <div id="lang-select">
+      <span id="other-languages">
+  {foreach from=$language_options key=$code item=$lang}
+          <span id="lang={$code}" onclick="setCookie('lang','{$code}',30)">{$lang}</span>
+  {/foreach}
+      </span>
+      <div id="selected-language-container">
+        <i class="gallery-icon-left-chevron"></i><span id="selected-language">{$language_options[$current_language]}</span>
+      </div>
+
+    </div>
+  </section>
+{/if}
+  
+</container>