Add plugin system and improve language handling

Add global and page-level plugin support Implement language-aware
content filtering Add month translations to language files Refactor date
formatting to use translations Move translation loading to plugin system
Improve content availability checks

app/plugins/global/languages.php

@@ -0,0 +1,85 @@
+<?php
+
+// Languages plugin - translation loading and filtering
+
+function loadTranslations(string $lang): array {
+    $defaultTranslationFile = dirname(__DIR__, 2) . "/default/languages/$lang.ini";
+    $customTranslationFile = dirname(__DIR__, 3) . "/custom/languages/$lang.ini";
+    
+    $translations = [];
+    
+    if (file_exists($defaultTranslationFile)) {
+        $translations = parse_ini_file($defaultTranslationFile) ?: [];
+    }
+    
+    if (file_exists($customTranslationFile)) {
+        $customTranslations = parse_ini_file($customTranslationFile) ?: [];
+        $translations = array_merge($translations, $customTranslations);
+    }
+    
+    return $translations;
+}
+
+function shouldHideUntranslated(): bool {
+    $configFile = file_exists(__DIR__ . '/../../../custom/config.ini')
+        ? __DIR__ . '/../../../custom/config.ini'
+        : __DIR__ . '/../../config.ini';
+    
+    if (!file_exists($configFile)) return true;
+    
+    $config = parse_ini_file($configFile, true);
+    return !isset($config['languages']['show_untranslated']) 
+        || $config['languages']['show_untranslated'] !== 'true';
+}
+
+function hasLanguageMetadata(string $dirPath, string $lang): bool {
+    $metadataFile = "$dirPath/metadata.ini";
+    if (!file_exists($metadataFile)) return false;
+    
+    $metadata = parse_ini_file($metadataFile, true);
+    if (!$metadata) return false;
+    
+    if (!isset($metadata[$lang]) || !is_array($metadata[$lang])) return false;
+    
+    // Check if language section has meaningful content (title or summary)
+    return isset($metadata[$lang]['title']) || isset($metadata[$lang]['summary']);
+}
+
+function hasLanguageContent(string $dirPath, string $lang, array $contentExtensions): bool {
+    if (!is_dir($dirPath)) return false;
+    
+    $files = scandir($dirPath) ?: [];
+    foreach ($files as $file) {
+        $ext = pathinfo($file, PATHINFO_EXTENSION);
+        if (!in_array($ext, $contentExtensions)) continue;
+        
+        $parts = explode('.', $file);
+        if (count($parts) >= 3) {
+            $fileLang = $parts[count($parts) - 2];
+            if ($fileLang === $lang && is_file("$dirPath/$file")) {
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
+function formatDate(string $dateString, string $lang): string {
+    if (!preg_match('/^(\d{4})-(\d{2})-(\d{2})/', $dateString, $matches)) {
+        return $dateString;
+    }
+    
+    $translations = loadTranslations($lang);
+    $day = (int)$matches[3];
+    $monthIndex = (int)$matches[2] - 1;
+    $year = $matches[1];
+    
+    if (isset($translations['months'])) {
+        $months = array_map('trim', explode(',', $translations['months']));
+        $month = $months[$monthIndex] ?? $matches[2];
+    } else {
+        $month = $matches[2];
+    }
+    
+    return "$day. $month $year";
+}