[glade] Add required dependencies to the README

[Juan Pablo Ugarte <jpu src gnome org>]

commit 01aaf9fe925493f9f508fbd9327eb7933173380c
Author: Jonathan Paugh <jpaugh pobox com>
Date:   Sun Apr 11 03:57:28 2021 -0500

    Add required dependencies to the README
    
    Both the gettext package and the itstools package are required to run
    ninja install without errors

 README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index b3b86971..f9401133 100644
--- a/README.md
+++ b/README.md
@@ -53,11 +53,12 @@ Optional dependencies:
 * libwebkit2gtk-4.0 - For Webkit plugin
 * python-gi - For Python plugin
 * libgjs - For JavaScript plugin
+* gettext, itstool - For translation support
 
 Download sources from git and build using meson/ninja
 
        # Install dependencies, for example in debian
-       sudo apt install gcc meson libgtk-3-dev libxml2-dev libgirepository1.0-dev xsltproc 
+       sudo apt install gcc meson libgtk-3-dev libxml2-dev libgirepository1.0-dev xsltproc gettext itstool
        
        # Optional dependencies
        sudo apt install libgjs-dev libwebkit2gtk-4.0-dev python-gi-dev glib-networking