[gnome-builder] buffer: fix grammar in a translatable string

[Piotr Drąg <piotrdrag src gnome org>]

commit 16e3d97b13f291e5e1e1154e622a806fc48e4952
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Sep 2 01:42:17 2017 +0200

    buffer: fix grammar in a translatable string
    
    Oh hey, the string freeze is no longer broken!

 libide/buffers/ide-buffer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libide/buffers/ide-buffer.c b/libide/buffers/ide-buffer.c
index 22b49f6..e7150d1 100644
--- a/libide/buffers/ide-buffer.c
+++ b/libide/buffers/ide-buffer.c
@@ -2672,7 +2672,7 @@ ide_buffer_get_symbol_at_location_async (IdeBuffer           *self,
       g_task_return_new_error (task,
                                G_IO_ERROR,
                                G_IO_ERROR_NOT_SUPPORTED,
-                               _("The current language lacks symbol resolver."));
+                               _("The current language lacks a symbol resolver."));
       return;
     }