SL-16874 Added tool tips to buttons displayed by llDialog()

doc/contributions.txt

@@ -373,6 +373,7 @@ Charlie Sazaland
 Chaser Zaks
     BUG-225599
     BUG-227485
+    SL-16874
 Cherry Cheevers
 ChickyBabes Zuzu
 Chorazin Allen

indra/newview/lltoastnotifypanel.cpp

@@ -89,6 +89,7 @@ LLButton* LLToastNotifyPanel::createButton(const LLSD& form_element, BOOL is_opt
 	const LLFontGL* font = make_small_btn ? sFontSmall: sFont; // for block and ignore buttons in script dialog
 	p.name = form_element["name"].asString();
 	p.label = form_element["text"].asString();
+	p.tool_tip = form_element["text"].asString();
 	p.font = font;
 	p.rect.height = BTN_HEIGHT;
 	p.click_callback.function(boost::bind(&LLToastNotifyPanel::onClickButton, userdata));