[gimp] app: better translatable text for "Indexed color" color space text…

[Jehan <jehanp src gnome org>]

commit 9c52af21ea20cb8bd52e5392eda5acb24e90dbde
Author: Jehan <jehan girinstud io>
Date:   Mon Nov 16 00:55:37 2020 +0100

    app: better translatable text for "Indexed color" color space text…
    
    … in Image properties window.
    
    Basically using non-translatable "%s (%d %s)" and filling it with
    "Indexed color" base type name and translatable _("colors") is very bad
    practice (localization-wise):
    
    - First it assumes everyone uses round brackets.
    - It also assumes the order of words (number before word it determines
      but even the image type before detail brackets).
    - And finally it doesn't handle plurals. Of course, we could say that
      the 1 color case is a very edge impractical case, but plural is not
      only about 1 vs other numbers. Some languages have more cases, and
      using ngettext allows translators to handle these.

 app/widgets/gimpimagepropview.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/app/widgets/gimpimagepropview.c b/app/widgets/gimpimagepropview.c
index c8622a70bb..584021e095 100644
--- a/app/widgets/gimpimagepropview.c
+++ b/app/widgets/gimpimagepropview.c
@@ -480,8 +480,10 @@ gimp_image_prop_view_update (GimpImagePropView *view)
       break;
     case GIMP_INDEXED:
       g_snprintf (buf, sizeof (buf),
-                  "%s (%d %s)", desc, gimp_image_get_colormap_size (image),
-                  _("colors"));
+                  ngettext ("Indexed color (monochrome)",
+                            "Indexed color (%d colors)",
+                            gimp_image_get_colormap_size (image)),
+                  gimp_image_get_colormap_size (image));
       break;
     }