doc: add note on Mac OS X terminal app and meta key (FAQ)

doc/de/weechat_faq.de.adoc

@@ -511,6 +511,11 @@ UXTerm*metaSendsEscape: true
 Danach muss resources neu geladen werden (`xrdb -override ~/.Xresources`) oder
 man startet X neu.
 
+// TRANSLATION MISSING
+If you are using the Mac OS X Terminal app, enable the option
+"Use option as meta key" in menu Settings / Keyboard. And then you can use the
+kbd:[Option] key as meta key.
+
 [[customize_key_bindings]]
 === Wie kann ich die Tastaturbelegung anpassen?
 

doc/en/weechat_faq.en.adoc

@@ -481,6 +481,10 @@ UXTerm*metaSendsEscape: true
 
 And then reload resources (`xrdb -override ~/.Xresources`) or restart X.
 
+If you are using the Mac OS X Terminal app, enable the option
+"Use option as meta key" in menu Settings / Keyboard. And then you can use the
+kbd:[Option] key as meta key.
+
 [[customize_key_bindings]]
 === How can I customize key bindings?
 

doc/fr/weechat_faq.fr.adoc

@@ -501,6 +501,10 @@ UXTerm*metaSendsEscape: true
 
 Puis recharger les ressources (`xrdb -override ~/.Xresources`) ou redémarrez X.
 
+Si vous utilisez l'application Terminal sous Mac OS X, activez l'option
+"Use option as meta key" dans le menu Réglages / Clavier. Vous pouvez alors
+utiliser la touche kbd:[Option] comme touche meta.
+
 [[customize_key_bindings]]
 === Comment puis-je configurer les raccourcis clavier ?
 

doc/it/weechat_faq.it.adoc

@@ -524,6 +524,11 @@ UXTerm*metaSendsEscape: true
 
 Al termine, ricaricare la configurazione (`xrdb -override ~/.Xresources`) o riavviare X.
 
+// TRANSLATION MISSING
+If you are using the Mac OS X Terminal app, enable the option
+"Use option as meta key" in menu Settings / Keyboard. And then you can use the
+kbd:[Option] key as meta key.
+
 [[customize_key_bindings]]
 === Come posso personalizzare le associazioni dei tasti?
 

doc/ja/weechat_faq.ja.adoc

@@ -478,6 +478,11 @@ UXTerm*metaSendsEscape: true
 
 このファイルをリロードするか (`xrdb -override ~/.Xresources`) または X を再起動してください。
 
+// TRANSLATION MISSING
+If you are using the Mac OS X Terminal app, enable the option
+"Use option as meta key" in menu Settings / Keyboard. And then you can use the
+kbd:[Option] key as meta key.
+
 [[customize_key_bindings]]
 === どうすればキー割り当てをカスタマイズできますか。
 

doc/pl/weechat_faq.pl.adoc

@@ -485,6 +485,11 @@ UXTerm*metaSendsEscape: true
 
 Następnie przeładować zasoby (`xrdb -override ~/.Xresources`) lub zrestartować X.
 
+// TRANSLATION MISSING
+If you are using the Mac OS X Terminal app, enable the option
+"Use option as meta key" in menu Settings / Keyboard. And then you can use the
+kbd:[Option] key as meta key.
+
 [[customize_key_bindings]]
 === Jak mogę zmienić przypisania klawiszy?