Improve the faq

docs/faq.md

@@ -1,5 +1,15 @@
 # GitBook FAQ
 
+#### How can I host/publish my book?
+
+Books can easily be published and hosted on [GitBook.com](https://www.gitbook.com). But GitBook output can be hosted on any static file hosting solution.
+
+#### What can I use to edit my content?
+
+Any text editor should work! But we advise using the [GitBook Editor](https://www.gitbook.com/editor). [GitBook.com](https://www.gitbook.com) also provides a web version of this editor.
+
+---
+
 #### Should I use an `.html` or `.md` extensions in my links?
 
 You should always use `.md` extensions for your relative links, GitBook will automatically replace these links by the right value when the pointing file is referenced in the Table of Contents.
@@ -8,6 +18,16 @@ You should always use `.md` extensions for your relative links, GitBook will aut
 
 Yes, GitBooks can be created in [sub-directories](structure.md#subdirectory). GitBook.com and the CLI also looks by default in a serie of [folders](structure.md).
 
+---
+
 #### Does GitBook support Math equations?
 
 GitBook supports math equations and TeX thanks to plugins. There are currently 2 official plugins to display math: [mathjax](https://plugins.gitbook.com/plugin/mathjax) and [katex](https://plugins.gitbook.com/plugin/katex).
+
+#### Can I customize/theme the output?
+
+Yes, both the website and ebook outputs can be customized using [themes](themes.md).
+
+#### Can I add interactive content (videos, etc)?
+
+GitBook is very [extensible](plugins.md). You can use [existing plugins](https://plugins.gitbook.com) or create your own!

docs/variables.md

@@ -19,6 +19,7 @@ The following is a reference of the available data during book's parsing and the
 | Variable | Description |
 | -------- | ----------- |
 | `book.[CONFIGURATION_DATA]` | All the `variables` set via the `book.json` are available through the book variable. |
+| `book.language` | Current language for a multilingual book |
 
 ### GitBook Variables