[gnome-boxes/dont-localize-color-attribute-in-en_GB] Don't translate color='' attribute to British English

[Will Thompson <wjt src gnome org>]

commit 576f25362792cb576cab56819f469054d48dbfe2
Author: Will Thompson <will willthompson co uk>
Date:   Wed Oct 24 09:40:14 2018 +0100

    Don't translate color='' attribute to British English
    
    This causes the following warning:
    
        Failed to set text '<markup>21.5 GB <span colour="grey">(200.7 kB
        used)</span></markup>' from markup due to error parsing markup:
        Attribute 'colour' is not allowed on the <span> tag on line 1 char
        45

 po/en_GB.po | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/po/en_GB.po b/po/en_GB.po
index 10a1f5f6..ef9ebea8 100644
--- a/po/en_GB.po
+++ b/po/en_GB.po
@@ -663,7 +663,7 @@ msgstr "System"
 #: src/i-properties-provider.vala:89
 #, c-format
 msgid "%s <span color=\"grey\">(%s used)</span>"
-msgstr "%s <span colour=\"grey\">(%s used)</span>"
+msgstr "%s <span color=\"grey\">(%s used)</span>"
 
 #. Translators: This is memory or disk size. E.g. "1 GB (recommended)".
 #: src/i-properties-provider.vala:101
@@ -799,7 +799,7 @@ msgid ""
 "<span color=\"grey\">Maximum Disk Size</span>\t\t %s <span color=\"grey"
 "\">(%s used)</span>"
 msgstr ""
-"<span colour=\"grey\">Maximum Disk Size</span>\t\t %s <span colour=\"grey"
+"<span color=\"grey\">Maximum Disk Size</span>\t\t %s <span color=\"grey"
 "\">(%s used)</span>"
 
 #: src/libvirt-machine-properties.vala:475