[LyX/master] Fix missing backspace in msgstr

[Jean-Marc Lasgouttes]

commit c5530589bb956c2f37555c002fbc70d3fcf8aca1
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Mon Jan 27 15:40:40 2020 +0100

    Fix missing backspace in msgstr
---
 po/ar.po |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/po/ar.po b/po/ar.po
index fa546a3..b8827e7 100644
--- a/po/ar.po
+++ b/po/ar.po
@@ -9790,7 +9790,7 @@ msgstr "ملحق \\Alph{appendix}:"
 
 #: lib/layouts/copernicus.layout:262
 msgid "\\Alph{appendix}\\arabic{subappendix}"
-msgstr "\\Alph{appendix}\arabic{subappendix}"
+msgstr "\\Alph{appendix}\\arabic{subappendix}"
 
 #: lib/layouts/copernicus.layout:273
 msgid "\\Alph{appendix}\\arabic{subappendix}.\\arabic{subsubappendix}"