v2.6.1d (Lyra): Plugin i18n, plugin editor vernieuwd, media invoegen

Plugin internationalisatie: plugins hebben eigen language/ mappen. Systeem
plugins volgen admin taal (admin.php), content plugins volgen content taal
(site.php). Fallback chain: geselecteerd -> plugin default_language -> CMS
default. PluginManager/AdminPluginAPI/CMSAPI uitgebreid met
getPluginTranslations()/t(). plugin.json settings ondersteunen
label_key/help_key/option_label_key.

Plugin uniformiteit: alle 6 plugins hebben uniforme structuur (README.md,
assets/.gitkeep, language/nl|en/). plugins/README.md herschreven.
guide plugin-development.md (NL+EN) volledig herschreven.

Plugin editor vernieuwd: geneste bestandsbrowser zijbalk, nieuw bestand
aanmaken, uploaden naar assets/, verwijderen en verplaatsen. Nieuwe routes:
plugins-file-upload, plugins-file-delete, plugins-file-move. Path-traversal
bescherming + protected plugins geblokkeerd.

Media invoegen in editor: nieuw /admin/media-list JSON endpoint + herbruikbare
_media-modal.twig include. Plugin-context scant assets/ map. editor-toolbar.js
modeMap uitgebreid voor css/scss/js/json.

Plugin overzicht knoppen: alleen iconen met title/aria-label.

Tests: pentest 30/30, WCAG 2.1 AA 25/25.

admin/theme/default/views/pages/plugins-move-form.twig

@@ -0,0 +1,39 @@
+{% extends "layouts/admin.twig" %}
+
+{% block title %}{{ ta.file|default('Bestand') }} {{ ta.move_suffix|default('verplaatsen') }} - {{ ta.admin_title|default('CodePress Admin') }}{% endblock %}
+
+{% block content %}
+<div class="d-flex justify-content-between align-items-center mb-4 flex-wrap gap-2">
+    <h2 class="mb-0"><i class="bi bi-arrows-move"></i> {{ ta.file|default('Bestand') }} {{ ta.move_suffix|default('verplaatsen') }}</h2>
+    <a href="/admin/plugins-edit?plugin={{ pluginName|url_encode }}&file={{ relFile|url_encode }}" class="btn btn-outline-secondary btn-sm">
+        <i class="bi bi-arrow-left"></i> {{ ta.back|default('Terug') }}
+    </a>
+</div>
+
+<form method="post" action="/admin/plugins-file-move?plugin={{ pluginName|url_encode }}&file={{ relFile|url_encode }}" class="card shadow-sm">
+    <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+    <input type="hidden" name="plugin" value="{{ pluginName }}">
+    <input type="hidden" name="file" value="{{ relFile }}">
+    <div class="card-body">
+        <div class="alert alert-info">
+            {{ ta.move_prefix|default('Verplaats') }} <strong>{{ itemName }}</strong>
+            {% if itemDir %}<span class="text-muted">({{ pluginName }}/{{ itemDir }})</span>{% else %}<span class="text-muted">({{ pluginName }}/)</span>{% endif %}
+            {{ ta.move_to|default('naar:') }}
+        </div>
+        <div class="mb-3">
+            <label for="destination" class="form-label">{{ ta.target_folder|default('Doelmap') }} <small class="text-muted">({{ pluginName }}/)</small></label>
+            <select class="form-select" id="destination" name="destination" required>
+                {% for directory in directories %}
+                <option value="{{ directory }}">{{ directory == '' ? '(plugin root)' : directory }}</option>
+                {% endfor %}
+            </select>
+        </div>
+    </div>
+    <div class="card-footer bg-white">
+        <button type="submit" class="btn btn-primary">
+            <i class="bi bi-check-lg"></i> {{ ta.move|default('Verplaatsen') }}
+        </button>
+        <a href="/admin/plugins-edit?plugin={{ pluginName|url_encode }}&file={{ relFile|url_encode }}" class="btn btn-outline-secondary">{{ ta.cancel|default('Annuleren') }}</a>
+    </div>
+</form>
+{% endblock %}