[gnome-builder] buildui: add tooltip to remove environment variable button

[Christian Hergert <chergert src gnome org>]

commit cb52dfd4a50cf918dd18ca59829c49ef6e9d97ed
Author: Christian Hergert <chergert redhat com>
Date:   Wed Oct 18 13:50:56 2017 -0700

    buildui: add tooltip to remove environment variable button

 src/libide/buildui/ide-environment-editor-row.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/libide/buildui/ide-environment-editor-row.ui 
b/src/libide/buildui/ide-environment-editor-row.ui
index 1a30ab7..56b176a 100644
--- a/src/libide/buildui/ide-environment-editor-row.ui
+++ b/src/libide/buildui/ide-environment-editor-row.ui
@@ -30,6 +30,7 @@
         <child>
           <object class="GtkButton" id="delete_button">
             <property name="visible">true</property>
+            <property name="tooltip-text" translatable="yes">Remove environment variable</property>
             <style>
               <class name="image-button"/>
               <class name="flat"/>