doc: add environment variables in user's guide

doc/de/weechat_user.de.adoc

@@ -494,6 +494,20 @@ Die Einstellungen für WeeChat können an die eigenen Bedürfnisse angepasst wer
 Veränderungen an der Konfigurationsdatei mit dem internen Befehl `/set` durchführt werden. (siehe
 <<weechat_commands,WeeChat Befehle>>).
 
+// TRANSLATION MISSING
+[[environment_variables]]
+=== Environment variables
+
+Some environment variables are used by WeeChat if they are defined:
+
+[width="100%",cols="1m,6",options="header"]
+|===
+| Name                 | Description
+| WEECHAT_HOME         | The WeeChat home (with configuration files, logs, scripts, ...).
+| WEECHAT_PASSPHRASE   | The passphrase used to decrypt secured data.
+| WEECHAT_EXTRA_LIBDIR | An extra directory to load plugins (from the "plugins" directory in this path).
+|===
+
 [[files_and_directories]]
 === Dateien und Verzeichnisse
 

doc/en/weechat_user.en.adoc

@@ -484,6 +484,19 @@ You can edit this file at your convenience to configure WeeChat or you can set
 parameters with `/set` command in WeeChat (see
 <<weechat_commands,WeeChat commands>>).
 
+[[environment_variables]]
+=== Environment variables
+
+Some environment variables are used by WeeChat if they are defined:
+
+[width="100%",cols="1m,6",options="header"]
+|===
+| Name                 | Description
+| WEECHAT_HOME         | The WeeChat home (with configuration files, logs, scripts, ...).
+| WEECHAT_PASSPHRASE   | The passphrase used to decrypt secured data.
+| WEECHAT_EXTRA_LIBDIR | An extra directory to load plugins (from the "plugins" directory in this path).
+|===
+
 [[files_and_directories]]
 === Files and directories
 

doc/fr/weechat_user.fr.adoc

@@ -494,6 +494,19 @@ Vous pouvez éditer ce fichier pour configurer WeeChat à votre convenance ou
 vous pouvez modifier les paramètres dans WeeChat avec la commande `/set`
 (voir <<weechat_commands,commandes WeeChat>>).
 
+[[environment_variables]]
+=== Variables d'environnement
+
+Des variables d'environnement sont utilisées par WeeChat si elles sont définies :
+
+[width="100%",cols="1m,6",options="header"]
+|===
+| Nom                  | Description
+| WEECHAT_HOME         | Le répertoire "maison" de WeeChat (avec les fichiers de configuration, logs, scripts, etc...).
+| WEECHAT_PASSPHRASE   | La phrase de chiffrement utilisée pour déchiffrer les données sécurisées.
+| WEECHAT_EXTRA_LIBDIR | Un répertoire supplémentaire pour charger les extensions (depuis le répertoire "plugins" sous ce chemin).
+|===
+
 [[files_and_directories]]
 === Fichiers et répertoires
 

doc/it/weechat_user.it.adoc

@@ -525,6 +525,20 @@ _~/.weechat/weechat.conf_.
 proprie esigenze, oppure impostando i parametri con il comando `/set`
 all'interno di WeeChat (consultare <<weechat_commands,comandi di WeeChat>>).
 
+// TRANSLATION MISSING
+[[environment_variables]]
+=== Environment variables
+
+Some environment variables are used by WeeChat if they are defined:
+
+[width="100%",cols="1m,6",options="header"]
+|===
+| Name                 | Description
+| WEECHAT_HOME         | The WeeChat home (with configuration files, logs, scripts, ...).
+| WEECHAT_PASSPHRASE   | The passphrase used to decrypt secured data.
+| WEECHAT_EXTRA_LIBDIR | An extra directory to load plugins (from the "plugins" directory in this path).
+|===
+
 // TRANSLATION MISSING
 [[files_and_directories]]
 === Files and directories

doc/ja/weechat_user.ja.adoc

@@ -489,6 +489,20 @@ WeeChat を設定するにはこのファイルを編集するか、WeeChat
 内で `/set` コマンドにパラメータを付けて設定します
 (<<weechat_commands,WeeChat コマンド>>を参照)。
 
+// TRANSLATION MISSING
+[[environment_variables]]
+=== Environment variables
+
+Some environment variables are used by WeeChat if they are defined:
+
+[width="100%",cols="1m,6",options="header"]
+|===
+| Name                 | Description
+| WEECHAT_HOME         | The WeeChat home (with configuration files, logs, scripts, ...).
+| WEECHAT_PASSPHRASE   | The passphrase used to decrypt secured data.
+| WEECHAT_EXTRA_LIBDIR | An extra directory to load plugins (from the "plugins" directory in this path).
+|===
+
 [[files_and_directories]]
 === ファイルとディレクトリ
 

doc/pl/weechat_user.pl.adoc

@@ -494,6 +494,20 @@ Możesz edytować ten plik wedle upodobań, żeby skonfigurować WeeChat, lub mo
 ustawić parametry za pomocą komendy `/set` z poziomu WeeChat (zobacz
 <<weechat_commands,Komendy WeeChat>>).
 
+// TRANSLATION MISSING
+[[environment_variables]]
+=== Environment variables
+
+Some environment variables are used by WeeChat if they are defined:
+
+[width="100%",cols="1m,6",options="header"]
+|===
+| Name                 | Description
+| WEECHAT_HOME         | The WeeChat home (with configuration files, logs, scripts, ...).
+| WEECHAT_PASSPHRASE   | The passphrase used to decrypt secured data.
+| WEECHAT_EXTRA_LIBDIR | An extra directory to load plugins (from the "plugins" directory in this path).
+|===
+
 [[files_and_directories]]
 === Pliki i foldery