Update documentation

doc/ldap-group-sync.markdown

@@ -52,6 +52,7 @@ define('LDAP_GROUP_FILTER', '(&(objectClass=group)(sAMAccountName=%s*))');
 With the filter given as example above, Kanboard will search for groups that match the query.
 If the end-user enter the text "My group" in the auto-complete box, Kanboard will return all groups that match the pattern: `(&(objectClass=group)(sAMAccountName=My group*))`.
 
-Note that the special characters `*` is important here, otherwise an exact match will be done.
+- Note 1: The special characters `*` is important here, otherwise an exact match will be done.
+- Note 2: This feature is only compatible with LDAP authentication configured in "proxy" or "anonymous" mode
 
 [More examples of LDAP filters for Active Directory](http://social.technet.microsoft.com/wiki/contents/articles/5392.active-directory-ldap-syntax-filters.aspx)

doc/plugin-authentication.markdown

@@ -37,3 +37,4 @@ Example of authentication plugins
 
 - [Authentication providers included in Kanboard](https://github.com/fguillot/kanboard/tree/master/app/Auth)
 - [Reverse-Proxy Authentication with LDAP support](https://github.com/kanboard/plugin-reverse-proxy-ldap)
+- [SMS Two-Factor Authentication](https://github.com/kanboard/plugin-sms-2fa)

doc/plugin-registration.markdown

@@ -82,7 +82,7 @@ $this->user->getById(123);
 Plugin Translations
 -------------------
 
-Plugin can be translated in the same way the rest of the application. You must load the translations yourself when the session is created:
+Plugin can be translated in the same way as the rest of the application. You must load the translations yourself when the session is created:
 
 ```php
 $this->on('app.bootstrap', function($container) {
@@ -90,7 +90,9 @@ $this->on('app.bootstrap', function($container) {
 });
 ```
 
-The translations must be stored in `plugins/Myplugin/Locale/xx_XX/translations.php`.
+The translations must be stored in the file `plugins/Myplugin/Locale/xx_XX/translations.php` (replace xx_XX by the language code fr_FR, en_US...).
+
+Translations are stored in a dictionary, if you would like to override an existing string, you just need to use the same key in your translation file.
 
 Dependency Injection Container
 ------------------------------

doc/plugins.markdown

@@ -26,6 +26,7 @@ Plugin creators should specify explicitly the compatible versions of Kanboard. I
 Examples of plugins
 -------------------
 
+- [SMS Two-Factor Authentication](https://github.com/kanboard/plugin-sms-2fa)
 - [Reverse-Proxy Authentication with LDAP support](https://github.com/kanboard/plugin-reverse-proxy-ldap)
 - [Slack](https://github.com/kanboard/plugin-slack)
 - [Hipchat](https://github.com/kanboard/plugin-hipchat)