fix(i18n): add missing dialogs.share_folder translation key

The share dialog for folders was failing because dialogs.share_folder
key was missing from all locale files. The contextMenus.js code
references this key when opening the share dialog for folders:

  window.i18n.t('dialogs.share_folder')

Added the missing key to all 14 locale files with appropriate
translations for each language.

Fixes #189

static/locales/ar.json

@@ -229,6 +229,7 @@
     "confirm_delete_share": "حذف رابط المشاركة",
     "confirm_delete_share_msg": "هل أنت متأكد أنك تريد حذف رابط المشاركة هذا؟",
     "share_file": "مشاركة الملف",
+    "share_folder": "مشاركة المجلد",
     "existing_shares": "المشاركات الحالية",
     "share_options": "خيارات المشاركة",
     "password": "كلمة المرور",

static/locales/de.json

@@ -226,6 +226,7 @@
     "confirm_delete_share": "Freigabelink löschen",
     "confirm_delete_share_msg": "Sind Sie sicher, dass Sie diesen Freigabelink löschen möchten?",
     "share_file": "Datei teilen",
+    "share_folder": "Ordner teilen",
     "existing_shares": "Bestehende Freigaben",
     "share_options": "Freigabeoptionen",
     "password": "Passwort",

static/locales/en.json

@@ -229,6 +229,7 @@
     "confirm_delete_share": "Delete share link",
     "confirm_delete_share_msg": "Are you sure you want to delete this shared link?",
     "share_file": "Share File",
+    "share_folder": "Share Folder",
     "existing_shares": "Existing Shares",
     "share_options": "Share Options",
     "password": "Password",

static/locales/es.json

@@ -229,6 +229,7 @@
     "confirm_delete_share": "Eliminar enlace compartido",
     "confirm_delete_share_msg": "¿Estás seguro de que quieres eliminar este enlace compartido?",
     "share_file": "Compartir Archivo",
+    "share_folder": "Compartir Carpeta",
     "existing_shares": "Compartidos Existentes",
     "share_options": "Opciones de Compartición",
     "password": "Contraseña",

static/locales/fa.json

@@ -213,6 +213,7 @@
     "and_contents": "و همهٔ محتویات آن",
     "no_undo": "این عملیات قابل بازگردانی نیست",
     "share_file": "هم‌رسانی پرونده",
+    "share_folder": "هم‌رسانی پوشه",
     "existing_shares": "هم‌رسانی موجود",
     "share_options": "گزینه‌های هم‌رسانی",
     "password": "گذرواژه",

static/locales/fr.json

@@ -226,6 +226,7 @@
     "confirm_delete_share": "Supprimer le lien de partage",
     "confirm_delete_share_msg": "Êtes-vous sûr de vouloir supprimer ce lien de partage ?",
     "share_file": "Partager le fichier",
+    "share_folder": "Partager le dossier",
     "existing_shares": "Partages existants",
     "share_options": "Options de partage",
     "password": "Mot de passe",

static/locales/hi.json

@@ -229,6 +229,7 @@
     "confirm_delete_share": "शेयर लिंक हटाएँ",
     "confirm_delete_share_msg": "क्या आप वाकई इस शेयर लिंक को हटाना चाहते हैं?",
     "share_file": "फ़ाइल साझा करें",
+    "share_folder": "फ़ोल्डर साझा करें",
     "existing_shares": "मौजूदा शेयर",
     "share_options": "शेयर विकल्प",
     "password": "पासवर्ड",

static/locales/it.json

@@ -226,6 +226,7 @@
     "confirm_delete_share": "Elimina link di condivisione",
     "confirm_delete_share_msg": "Sei sicuro di voler eliminare questo link di condivisione?",
     "share_file": "Condividi File",
+    "share_folder": "Condividi Cartella",
     "existing_shares": "Condivisioni Esistenti",
     "share_options": "Opzioni di Condivisione",
     "password": "Password",

static/locales/ja.json

@@ -229,6 +229,7 @@
     "confirm_delete_share": "共有リンクを削除",
     "confirm_delete_share_msg": "この共有リンクを削除しますか？",
     "share_file": "ファイルを共有",
+    "share_folder": "フォルダを共有",
     "existing_shares": "既存の共有",
     "share_options": "共有オプション",
     "password": "パスワード",

static/locales/ko.json

@@ -229,6 +229,7 @@
     "confirm_delete_share": "공유 링크 삭제",
     "confirm_delete_share_msg": "이 공유 링크를 삭제하시겠습니까?",
     "share_file": "파일 공유",
+    "share_folder": "폴��� 공유",
     "existing_shares": "기존 공유",
     "share_options": "공유 옵션",
     "password": "비밀번호",

static/locales/nl.json

@@ -226,6 +226,7 @@
     "confirm_delete_share": "Deellink verwijderen",
     "confirm_delete_share_msg": "Weet je zeker dat je deze deellink wilt verwijderen?",
     "share_file": "Bestand delen",
+    "share_folder": "Map delen",
     "existing_shares": "Bestaande delingen",
     "share_options": "Deelopties",
     "password": "Wachtwoord",

static/locales/pt.json

@@ -226,6 +226,7 @@
     "confirm_delete_share": "Excluir link de compartilhamento",
     "confirm_delete_share_msg": "Tem certeza de que deseja excluir este link de compartilhamento?",
     "share_file": "Compartilhar arquivo",
+    "share_folder": "Compartilhar pasta",
     "existing_shares": "Compartilhamentos existentes",
     "share_options": "Opções de compartilhamento",
     "password": "Senha",

static/locales/ru.json

@@ -229,6 +229,7 @@
     "confirm_delete_share": "Удалить ссылку общего доступа",
     "confirm_delete_share_msg": "Вы уверены, что хотите удалить эту ссылку общего доступа?",
     "share_file": "Поделиться файлом",
+    "share_folder": "Поделиться папкой",
     "existing_shares": "Существующие общие доступы",
     "share_options": "Параметры общего доступа",
     "password": "Пароль",

static/locales/zh.json

@@ -175,6 +175,7 @@
     "and_contents": "及其所有内容",
     "no_undo": "此操作无法撤销",
     "share_file": "共享文件",
+    "share_folder": "共享文件夹",
     "existing_shares": "现有共享",
     "share_options": "共享选项",
     "password": "密码",