[pitivi] data: Change "Link" to "Constrain proportions"

[Alexandru Băluț <alexbalut src gnome org>]

commit 63f0793cbb92f5fdf550a769ea56a7eaf1277e0f
Author: Diego Garcia Gangl <dnicolas gmail com>
Date:   Fri Mar 29 14:04:15 2019 -0300

    data: Change "Link" to "Constrain proportions"

 data/ui/projectsettings.ui | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/data/ui/projectsettings.ui b/data/ui/projectsettings.ui
index 45c6ee87..5aa8a52a 100644
--- a/data/ui/projectsettings.ui
+++ b/data/ui/projectsettings.ui
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.22.0 -->
+<!-- Generated with glade 3.22.1 -->
 <interface>
   <requires lib="gtk+" version="3.10"/>
   <object class="GtkAdjustment" id="adjustment1">
@@ -30,6 +30,9 @@
     <property name="window_position">center-on-parent</property>
     <property name="type_hint">dialog</property>
     <signal name="response" handler="_responseCb" swapped="no"/>
+    <child type="titlebar">
+      <placeholder/>
+    </child>
     <child internal-child="vbox">
       <object class="GtkBox" id="dialog-vbox1">
         <property name="visible">True</property>
@@ -258,10 +261,11 @@
                                 </child>
                                 <child>
                                   <object class="GtkCheckButton" id="constrain_sar_button">
-                                    <property name="label" translatable="yes" comments="When checked, 
changing the width or height affects also the other so that the aspect ratio value (width / height) does not 
change.">Link</property>
+                                    <property name="label" translatable="yes" comments="When checked, 
changing the width or height affects also the other so that the aspect ratio value (width / height) does not 
change.">Constrain proportions</property>
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
+                                    <property name="tooltip_text" translatable="yes">Maintain aspect 
ratio</property>
                                     <property name="halign">start</property>
                                     <property name="xalign">0.5</property>
                                     <property name="draw_indicator">True</property>