[calls] new-call-box: Add placeholder texts for text input fields

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit da4c6b043afc91995ac8c60694aa37e6e6948a0d
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Sat Aug 14 19:18:16 2021 +0200

    new-call-box: Add placeholder texts for text input fields

 src/ui/new-call-box.ui | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/ui/new-call-box.ui b/src/ui/new-call-box.ui
index 7f9b4da8..edc1f0dc 100644
--- a/src/ui/new-call-box.ui
+++ b/src/ui/new-call-box.ui
@@ -31,6 +31,7 @@
       <object class="GtkEntry" id="address_entry">
         <property name="visible" bind-source="CallsNewCallBox" bind-property="numeric-input-only" 
bind-flags="sync-create|invert-boolean"/>
         <property name="xalign">0.5</property>
+        <property name="placeholder-text" translatable="yes">Enter a VoIP address</property>
         <style>
           <class name="address-entry"/>
         </style>
@@ -42,6 +43,7 @@
         <property name="visible" bind-source="CallsNewCallBox" bind-property="numeric-input-only" 
bind-flags="sync-create"/>
         <property name="hexpand">True</property>
         <property name="xalign">0.5</property>
+        <property name="placeholder-text" translatable="yes">Enter a number</property>
         <style>
           <class name="phone-number-entry"/>
         </style>