Features doc: add link to Arabic translation

Medelinor has translated the features.md doc to Arabic. This change adds
a link to his translation.

Bug: twpowertools:50
Change-Id: I703284eba646376c87b5bf81b0460d7bbd0cb679
diff --git a/docs/features.es.md b/docs/features.es.md
index f238b66..f6629be 100644
--- a/docs/features.es.md
+++ b/docs/features.es.md
@@ -1,4 +1,5 @@
 [English](features.md) • [Русский](features.ru.md)
+• [العربية](https://docs.google.com/document/d/1QgMy4wQ0RNkreYJzaqJriXvR8xu9zI0vzoPfcDYMKU8/preview)
 
 # Funciones
 La extensión Herramientas Avanzadas para TW ofrece las siguientes
diff --git a/docs/features.md b/docs/features.md
index 0b340c7..187a710 100644
--- a/docs/features.md
+++ b/docs/features.md
@@ -1,4 +1,5 @@
 [En español](features.es.md) • [Русский](features.ru.md)
+• [العربية](https://docs.google.com/document/d/1QgMy4wQ0RNkreYJzaqJriXvR8xu9zI0vzoPfcDYMKU8/preview)
 
 # Features
 The TW Power Tools extension offers the following features/options:
diff --git a/docs/features.ru.md b/docs/features.ru.md
index 638dcb5..56ae57c 100644
--- a/docs/features.ru.md
+++ b/docs/features.ru.md
@@ -1,4 +1,5 @@
 [English](features.md) • [En español](features.es.md)
+• [العربية](https://docs.google.com/document/d/1QgMy4wQ0RNkreYJzaqJriXvR8xu9zI0vzoPfcDYMKU8/preview)
 
 # Особенности
 Расширение TW Power Tools предлагает следующие функции/опции: