[pitivi] build: Forward LC_ env vars when running in sandbox

[Alexandru Băluț <alexbalut src gnome org>]

commit ae14b07e8adcd0629492bcd3765c9e0a252783fe
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue Feb 13 23:32:51 2018 +0100

    build: Forward LC_ env vars when running in sandbox
    
    Differential Revision: https://phabricator.freedesktop.org/D1952

 build/flatpak/pitivi-flatpak |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/flatpak/pitivi-flatpak b/build/flatpak/pitivi-flatpak
index 48c9333..e474bed 100755
--- a/build/flatpak/pitivi-flatpak
+++ b/build/flatpak/pitivi-flatpak
@@ -583,7 +583,7 @@ class PitiviFlatpak:  # pylint: disable=too-many-instance-attributes
         # The forwarded environment variables.
         forwarded = {}
         for envvar, value in os.environ.items():
-            if envvar.split("_")[0] in ("GST", "GTK", "PITIVI") or \
+            if envvar.split("_")[0] in ("GST", "GTK", "PITIVI", "LC") or \
                     envvar in ["DISPLAY", "LANG"]:
                 forwarded[envvar] = value