Use Bootstrap tooltips instead of plain title attributes

By using data-original-title the tooltips live update without reapplying the
js code, such as .tooltip('fixTitle') each time the content changes. This
method also works well with angular expressions:

    data-original-title="{{'Download Rate' | translate}}"

This example provides a bootstrap tooltip saying 'Download Rate' that changes
automatically when the language is updated.

gui/dark/assets/css/overrides.css

@@ -71,6 +71,10 @@ identicon {
     min-width: 250px;
 }
 
+.tooltip{
+    word-wrap:break-word;
+}
+
 .panel-heading .fa, .modal-header .fa {
     margin-right: 10px;
 }