doc: fix example of weechat.command without buffer: it is executed on current buffer, not core buffer (scripting guide)

doc/de/weechat_scripting.de.txt

@@ -555,9 +555,10 @@ mit der [Enter] Taste bestätigen.
 
 Beispiele:
 
+// TRANSLATION MISSING
 [source,python]
 ----------------------------------------
-# führt den Befehl "/help" im Core Buffer aus
+# execute command "/help" on current buffer (result is on core buffer)
 weechat.command("", "/help")
 
 # sendet den Text "Hallo" in den IRC Channel #weechat (die Teilnehmer des Channels sehen diese Nachricht)

doc/en/weechat_scripting.en.txt

@@ -548,7 +548,7 @@ Examples:
 
 [source,python]
 ----------------------------------------
-# execute command "/help" on core buffer
+# execute command "/help" on current buffer (result is on core buffer)
 weechat.command("", "/help")
 
 # send "hello" to #weechat IRC channel (users on channel will see message)

doc/fr/weechat_scripting.fr.txt

@@ -560,7 +560,7 @@ Exemples :
 
 [source,python]
 ----------------------------------------
-# exécuter la commande "/help" sur le tampon core
+# exécuter la commande "/help" sur le tampon courant (le résultat est sur le tampon core)
 weechat.command("", "/help")
 
 # envoyer "bonjour" au canal IRC #weechat (les utilisateurs sur le canal verront le message)

doc/it/weechat_scripting.it.txt

@@ -556,9 +556,10 @@ se si digitasse del testo o un comando, seguiti da [Enter].
 
 Esempi:
 
+// TRANSLATION MISSING
 [source,python]
 ----------------------------------------
-# esegue il comando "/help" sul buffer core
+# execute command "/help" on current buffer (result is on core buffer)
 weechat.command("", "/help")
 
 # invia "hello" sul canale IRC #weechat  (gli utenti sul canale vedranno il messaggio)

doc/ja/weechat_scripting.ja.txt

@@ -527,9 +527,10 @@ Print 関数は Perl/Ruby/Lua/Tcl では `print` で、Python では `prnt` で
 
 例:
 
+// TRANSLATION MISSING
 [source,python]
 ----------------------------------------
-# コマンド "/help" をコアバッファで実行
+# execute command "/help" on current buffer (result is on core buffer)
 weechat.command("", "/help")
 
 # テキスト "hello" を #weechat IRC チャンネルに送信 (このチャンネルにいるユーザにはメッセージが見えます。)

doc/pl/weechat_scripting.pl.txt

@@ -544,9 +544,10 @@ w linii poleceń i wcisnąć [Enter].
 
 Przykłady:
 
+// TRANSLATION MISSING
 [source,python]
 ----------------------------------------
-# wykona komendę "/help" w głównym buforze
+# execute command "/help" on current buffer (result is on core buffer)
 weechat.command("", "/help")
 
 # wyśle "witaj" na kanał #weechat (użytkownicy na kanale zobaczą wiadomość)