doc: add note about constants in lua, fix lua example (scripting guide)

doc/de/weechat_scripting.de.txt

@@ -71,6 +71,9 @@ Lua
 ^^^
 
 * Funktionen werden im Format `weechat.xxx(arg1, arg2, ...)` ausgeführt
+// TRANSLATION MISSING
+* Constants in API are in fact functions, the returned value must be used as
+  constant (not the function itself).
 
 Tcl
 ^^^
@@ -331,7 +334,7 @@ Weechat.hook_timer(1000, 0, 1, "timer_cb", "test");
 ----------------------------------------
 function timer_cb(data, remaining_calls)
     weechat.print("", "timer! data="..data)
-    return weechat.WEECHAT_RC_OK
+    return weechat.WEECHAT_RC_OK()
 end
 
 weechat.hook_timer(1000, 0, 1, "timer_cb", "test")

doc/en/weechat_scripting.en.txt

@@ -70,6 +70,8 @@ Lua
 ^^^
 
 * Functions are called with `weechat.xxx(arg1, arg2, ...)`
+* Constants in API are in fact functions, the returned value must be used as
+  constant (not the function itself).
 
 Tcl
 ^^^
@@ -323,7 +325,7 @@ Weechat.hook_timer(1000, 0, 1, "timer_cb", "test");
 ----------------------------------------
 function timer_cb(data, remaining_calls)
     weechat.print("", "timer! data="..data)
-    return weechat.WEECHAT_RC_OK
+    return weechat.WEECHAT_RC_OK()
 end
 
 weechat.hook_timer(1000, 0, 1, "timer_cb", "test")

doc/fr/weechat_scripting.fr.txt

@@ -72,6 +72,8 @@ Lua
 ^^^
 
 * Les fonctions sont appelées par `weechat.xxx(arg1, arg2, ...)`
+* Les constantes dans l'API sont en fait des fonctions, la valeur retournée doit
+  être utilisée comme constante (et non la fonction elle-même).
 
 Tcl
 ^^^
@@ -333,7 +335,7 @@ Weechat.hook_timer(1000, 0, 1, "timer_cb", "test");
 ----------------------------------------
 function timer_cb(data, remaining_calls)
     weechat.print("", "timer! data="..data)
-    return weechat.WEECHAT_RC_OK
+    return weechat.WEECHAT_RC_OK()
 end
 
 weechat.hook_timer(1000, 0, 1, "timer_cb", "test")

doc/it/weechat_scripting.it.txt

@@ -72,6 +72,9 @@ Lua
 ^^^
 
 * Le funzioni sono chiamate con `weechat.xxx(arg1, arg2, ...)`
+// TRANSLATION MISSING
+* Constants in API are in fact functions, the returned value must be used as
+  constant (not the function itself).
 
 Tcl
 ^^^
@@ -336,7 +339,7 @@ Weechat.hook_timer(1000, 0, 1, "timer_cb", "test");
 ----------------------------------------
 function timer_cb(data, remaining_calls)
     weechat.print("", "timer! data="..data)
-    return weechat.WEECHAT_RC_OK
+    return weechat.WEECHAT_RC_OK()
 end
 
 weechat.hook_timer(1000, 0, 1, "timer_cb", "test")

doc/ja/weechat_scripting.ja.txt

@@ -63,6 +63,9 @@ Weechat.config_new_option(config, section, "name", "string", "description of opt
 ==== Lua ====
 
 * 関数は `weechat.xxx(arg1, arg2, ...)` のように呼び出してください。
+// TRANSLATION MISSING
+* Constants in API are in fact functions, the returned value must be used as
+  constant (not the function itself).
 
 ==== Tcl ====
 
@@ -316,7 +319,7 @@ Weechat.hook_timer(1000, 0, 1, "timer_cb", "test");
 ----------------------------------------
 function timer_cb(data, remaining_calls)
     weechat.print("", "timer! data="..data)
-    return weechat.WEECHAT_RC_OK
+    return weechat.WEECHAT_RC_OK()
 end
 
 weechat.hook_timer(1000, 0, 1, "timer_cb", "test")

doc/pl/weechat_scripting.pl.txt

@@ -71,6 +71,9 @@ Lua
 ^^^
 
 * Funkcje są wywoływane za pomocą `weechat.xxx(arg1, arg2, ...)`
+// TRANSLATION MISSING
+* Constants in API are in fact functions, the returned value must be used as
+  constant (not the function itself).
 
 Tcl
 ^^^
@@ -327,7 +330,7 @@ Weechat.hook_timer(1000, 0, 1, "timer_cb", "test");
 ----------------------------------------
 function timer_cb(data, remaining_calls)
     weechat.print("", "timer! data="..data)
-    return weechat.WEECHAT_RC_OK
+    return weechat.WEECHAT_RC_OK()
 end
 
 weechat.hook_timer(1000, 0, 1, "timer_cb", "test")