[latexila] Symbols: add tooltip for the clear button

[Sébastien Wilmet <swilmet src gnome org>]

commit 5c54db025deea57abececeb70d619eaa3819bbc4
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Jan 18 18:40:49 2015 +0100

    Symbols: add tooltip for the clear button
    
    So it's _clear_er.

 src/symbols_view.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/symbols_view.vala b/src/symbols_view.vala
index 08f83ac..4427fff 100644
--- a/src/symbols_view.vala
+++ b/src/symbols_view.vala
@@ -156,6 +156,7 @@ public class SymbolsView : Grid
     {
         _clear_button = new Button.with_mnemonic (_("_Clear"));
         _clear_button.margin_end = 3;
+        _clear_button.tooltip_text = _("Clear most used symbols");
 
         _clear_button.clicked.connect (() =>
         {