doc: add chapter about buffer property "highlight_regex" in user's guide

doc/de/weechat_user.de.adoc

@@ -1188,6 +1188,23 @@ from nicks beginning with "toto":
 /set weechat.look.highlight_tags "nick_flashcode,irc_notice+nick_toto*"
 ----
 
+[[highlights_regex_buffer]]
+==== Set extra highlights on buffer
+
+You can force highlight using a regular expression with the buffer property
+"highlight_regex".
+
+For example to force the highlight on all messages in the current buffer:
+
+----
+/buffer set highlight_regex .*
+----
+
+[NOTE]
+The buffer property "highlight_regex" is not saved in configuration. +
+You can easily save it with the script _buffer_autoset.py_: you can install it
+with `/script install buffer_autoset.py` and get help with `/help autosetbuffer`.
+
 [[key_bindings]]
 === Standard Tastenbelegung
 

doc/en/weechat_user.en.adoc

@@ -1164,6 +1164,23 @@ from nicks beginning with "toto":
 /set weechat.look.highlight_tags "nick_flashcode,irc_notice+nick_toto*"
 ----
 
+[[highlights_regex_buffer]]
+==== Set extra highlights on buffer
+
+You can force highlight using a regular expression with the buffer property
+"highlight_regex".
+
+For example to force the highlight on all messages in the current buffer:
+
+----
+/buffer set highlight_regex .*
+----
+
+[NOTE]
+The buffer property "highlight_regex" is not saved in configuration. +
+You can easily save it with the script _buffer_autoset.py_: you can install it
+with `/script install buffer_autoset.py` and get help with `/help autosetbuffer`.
+
 [[key_bindings]]
 === Default key bindings
 

doc/fr/weechat_user.fr.adoc

@@ -1201,6 +1201,26 @@ toutes les notices des pseudos commençant par "toto" :
 /set weechat.look.highlight_tags "nick_flashcode,irc_notice+nick_toto*"
 ----
 
+[[highlights_regex_buffer]]
+==== Définir des highlights supplémentaires sur le tampon
+
+Vous pouvez forcer le highlight en utilisant une expression regulière avec la
+propriété de tampon "highlight_regex".
+
+Par exemple pour forcer le highlight sur tous les messages dans le canal
+courant :
+
+----
+/buffer set highlight_regex .*
+----
+
+[NOTE]
+La propriété de tampon "highlight_regex" n'est pas sauvegardée dans la
+configuration. +
+Vous pouvez facilement la sauvegarder avec le script _buffer_autoset.py_ : vous
+pouvez l'installer avec `/script install buffer_autoset.py` et obtenir de l'aide
+avec `/help autosetbuffer`.
+
 [[key_bindings]]
 === Raccourcis clavier par défaut
 

doc/it/weechat_user.it.adoc

@@ -1223,6 +1223,23 @@ from nicks beginning with "toto":
 /set weechat.look.highlight_tags "nick_flashcode,irc_notice+nick_toto*"
 ----
 
+[[highlights_regex_buffer]]
+==== Set extra highlights on buffer
+
+You can force highlight using a regular expression with the buffer property
+"highlight_regex".
+
+For example to force the highlight on all messages in the current buffer:
+
+----
+/buffer set highlight_regex .*
+----
+
+[NOTE]
+The buffer property "highlight_regex" is not saved in configuration. +
+You can easily save it with the script _buffer_autoset.py_: you can install it
+with `/script install buffer_autoset.py` and get help with `/help autosetbuffer`.
+
 [[key_bindings]]
 === Associazione tasti predefinita
 

doc/ja/weechat_user.ja.adoc

@@ -1169,6 +1169,23 @@ from nicks beginning with "toto":
 /set weechat.look.highlight_tags "nick_flashcode,irc_notice+nick_toto*"
 ----
 
+[[highlights_regex_buffer]]
+==== Set extra highlights on buffer
+
+You can force highlight using a regular expression with the buffer property
+"highlight_regex".
+
+For example to force the highlight on all messages in the current buffer:
+
+----
+/buffer set highlight_regex .*
+----
+
+[NOTE]
+The buffer property "highlight_regex" is not saved in configuration. +
+You can easily save it with the script _buffer_autoset.py_: you can install it
+with `/script install buffer_autoset.py` and get help with `/help autosetbuffer`.
+
 [[key_bindings]]
 === デフォルトのキー割り当て
 

doc/pl/weechat_user.pl.adoc

@@ -1180,6 +1180,23 @@ from nicks beginning with "toto":
 /set weechat.look.highlight_tags "nick_flashcode,irc_notice+nick_toto*"
 ----
 
+[[highlights_regex_buffer]]
+==== Set extra highlights on buffer
+
+You can force highlight using a regular expression with the buffer property
+"highlight_regex".
+
+For example to force the highlight on all messages in the current buffer:
+
+----
+/buffer set highlight_regex .*
+----
+
+[NOTE]
+The buffer property "highlight_regex" is not saved in configuration. +
+You can easily save it with the script _buffer_autoset.py_: you can install it
+with `/script install buffer_autoset.py` and get help with `/help autosetbuffer`.
+
 [[key_bindings]]
 === Domyślne skróty klawiszowe