doc: add workaround for download of plugins.xml.gz on macOS (FAQ)

doc/de/weechat_faq.de.adoc

@@ -1174,6 +1174,15 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+// TRANSLATION MISSING
+If you're running macOS and the downloaded file has a size of 0 bytes,
+try to set this variable in your shell initialization file or on command line,
+before starting WeeChat:
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 [[spell_dictionaries]]
 === Ich habe aspell Wörterbücher auf mein System installiert. Wie kann ich diese nutzen, ohne WeeChat neu starten zu müssen?
 

doc/en/weechat_faq.en.adoc

@@ -1083,6 +1083,14 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+If you're running macOS and the downloaded file has a size of 0 bytes,
+try to set this variable in your shell initialization file or on command line,
+before starting WeeChat:
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 [[spell_dictionaries]]
 === I installed aspell dictionaries on my system, how can I use them without restarting WeeChat?
 

doc/es/weechat_faq.es.adoc

@@ -1086,6 +1086,15 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+// TRANSLATION MISSING
+If you're running macOS and the downloaded file has a size of 0 bytes,
+try to set this variable in your shell initialization file or on command line,
+before starting WeeChat:
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 [[spell_dictionaries]]
 === Instalé los diccionarios aspell en mi sistema, ¿cómo puedo utilizarlos sin necesidad de reiniciar WeeChat?
 

doc/fr/weechat_faq.fr.adoc

@@ -1123,6 +1123,14 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+Si vous êtes sous macOS et que le fichier téléchargé a une taille de 0 octet,
+essayez de définir cette variable dans votre fichier d'initialisation du shell
+ou sur la ligne de commande, avant de démarrer WeeChat :
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 [[spell_dictionaries]]
 === J'ai installé des dictionnaires aspell sur mon système, comment les utiliser sans redémarrer WeeChat ?
 

doc/it/weechat_faq.it.adoc

@@ -1173,6 +1173,15 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+// TRANSLATION MISSING
+If you're running macOS and the downloaded file has a size of 0 bytes,
+try to set this variable in your shell initialization file or on command line,
+before starting WeeChat:
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 // TRANSLATION MISSING
 [[spell_dictionaries]]
 === I installed aspell dictionaries on my system, how can I use them without restarting WeeChat?

doc/ja/weechat_faq.ja.adoc

@@ -1089,6 +1089,15 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+// TRANSLATION MISSING
+If you're running macOS and the downloaded file has a size of 0 bytes,
+try to set this variable in your shell initialization file or on command line,
+before starting WeeChat:
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 [[spell_dictionaries]]
 === システムに aspell 辞書をインストールした後、WeeChat を再起動せずにそれを使う方法を教えてください。
 

doc/pl/weechat_faq.pl.adoc

@@ -1089,6 +1089,15 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+// TRANSLATION MISSING
+If you're running macOS and the downloaded file has a size of 0 bytes,
+try to set this variable in your shell initialization file or on command line,
+before starting WeeChat:
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 [[spell_dictionaries]]
 === Zainstalowałem słowniki aspell w systemie, jak mogę ich użyć bez restartowania WeeChat?
 

doc/sr/weechat_faq.sr.adoc

@@ -943,6 +943,15 @@ $ cd ~/.cache/weechat/script
 $ curl -O https://weechat.org/files/plugins.xml.gz
 ----
 
+// TRANSLATION MISSING
+If you're running macOS and the downloaded file has a size of 0 bytes,
+try to set this variable in your shell initialization file or on command line,
+before starting WeeChat:
+
+----
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+----
+
 [[spell_dictionaries]]
 === Инсталирао сам aspell речнике у свој систем, како могу да их користим без потребе да поново покрећем програм WeeChat?