doc: add command "apt-get build-dep weechat" in user's guide

doc/de/weechat_user.de.adoc

@@ -137,6 +137,15 @@ ECDSA-NIST256P-CHALLENGE durchzuführen. +
 ^(4)^ Die empfohlene Version ist 2.7 (alle Skripten laufen mit der Version 2.7,
 aber nicht mit Version ≤ 2.6 oder ≥ 3.0).
 
+// TRANSLATION MISSING
+If you are using a Debian/Ubuntu based distribution, and if you have some
+"deb-src" source entries in your file _/etc/apt/sources.list_, you can install
+all dependencies with the command:
+
+----
+# apt-get build-dep weechat
+----
+
 [[compile_with_cmake]]
 ==== Kompilieren mit cmake
 

doc/en/weechat_user.en.adoc

@@ -130,6 +130,14 @@ ECDSA-NIST256P-CHALLENGE. +
 ^(4)^ Recommended Python version is 2.7 (all scripts run fine with version 2.7,
 but not with versions ≤ 2.6 or ≥ 3.0).
 
+If you are using a Debian/Ubuntu based distribution, and if you have some
+"deb-src" source entries in your file _/etc/apt/sources.list_, you can install
+all dependencies with the command:
+
+----
+# apt-get build-dep weechat
+----
+
 [[compile_with_cmake]]
 ==== Compile with cmake
 

doc/fr/weechat_user.fr.adoc

@@ -133,6 +133,14 @@ ECDSA-NIST256P-CHALLENGE. +
 ^(4)^ La version recommandée de Python est 2.7 (tous les scripts tournent bien
 avec la version 2.7, mais pas avec les versions ≤ 2.6 ou ≥ 3.0).
 
+Si vous utilisez une distribution basée sur Debian ou Ubuntu, et si vous avez
+des entrées source "deb-src" dans votre fichier _/etc/apt/sources.list_, vous
+pouvez installer toutes les dépendances avec la commande :
+
+----
+# apt-get build-dep weechat
+----
+
 [[compile_with_cmake]]
 ==== Compilation avec cmake
 

doc/it/weechat_user.it.adoc

@@ -155,6 +155,15 @@ ECDSA-NIST256P-CHALLENGE. +
 ^(4)^ La versione raccomandata di Python è la 2.7 (tutti gli script funzionano
 correttamente con la versione 2.7, ma non con le versioni ≤ 2.6 o ≥ 3.0).
 
+// TRANSLATION MISSING
+If you are using a Debian/Ubuntu based distribution, and if you have some
+"deb-src" source entries in your file _/etc/apt/sources.list_, you can install
+all dependencies with the command:
+
+----
+# apt-get build-dep weechat
+----
+
 [[compile_with_cmake]]
 ==== Compilazione con cmake
 

doc/ja/weechat_user.ja.adoc

@@ -135,6 +135,15 @@ OS X では http://brew.sh/[Homebrew] を使ってください:
 ^(4)^ Python はバージョン 2.7 をお勧めします (全てのスクリプトはバージョン 2.7
 で正しく動きますが、バージョン 2.6 以下または 3.0 以上では正しく動きません)。
 
+// TRANSLATION MISSING
+If you are using a Debian/Ubuntu based distribution, and if you have some
+"deb-src" source entries in your file _/etc/apt/sources.list_, you can install
+all dependencies with the command:
+
+----
+# apt-get build-dep weechat
+----
+
 [[compile_with_cmake]]
 ==== cmake によるコンパイル
 

doc/pl/weechat_user.pl.adoc

@@ -135,6 +135,15 @@ mechanizmu ECDSA-NIST256P-CHALLENGE. +
 ^(4)^ Zalecana wersja Pythona to 2.7 (wszystkie skrypty działają z wersją 2.7,
 ale nie w wersjami ≤ 2.6 lub ≥ 3.0).
 
+// TRANSLATION MISSING
+If you are using a Debian/Ubuntu based distribution, and if you have some
+"deb-src" source entries in your file _/etc/apt/sources.list_, you can install
+all dependencies with the command:
+
+----
+# apt-get build-dep weechat
+----
+
 [[compile_with_cmake]]
 ==== Kompilacja z użyciem cmake