[gimp] Update Catalan translation

[Jordi Mas <jmas src gnome org>]

commit 062f4478b6ef3145be000bae9a7fc681d4e08b70
Author: Jordi Mas <jmas softcatala org>
Date:   Thu Sep 9 21:41:56 2021 +0200

    Update Catalan translation

 po-plug-ins/ca.po | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/po-plug-ins/ca.po b/po-plug-ins/ca.po
index 4707239c31..0e943983f3 100644
--- a/po-plug-ins/ca.po
+++ b/po-plug-ins/ca.po
@@ -5463,11 +5463,11 @@ msgstr "Ajusta quant canvia aleatòriament la saturació del color"
 
 #: ../plug-ins/common/sparkle.c:565
 msgid "_Preserve luminosity"
-msgstr "_Preserva la lluminositat"
+msgstr "_Conserva la lluminositat"
 
 #: ../plug-ins/common/sparkle.c:572
 msgid "Should the luminosity be preserved?"
-msgstr "Cal preservar la lluminositat?"
+msgstr "Cal conservar la lluminositat?"
 
 #: ../plug-ins/common/sparkle.c:581
 msgid "In_verse"