[gnome-calculator] Fix broken markup in Xhosa UI translation

[Andre Klapper <aklapper src gnome org>]

commit 1f1b3e9d750c75ae1010f1737b1f9439d5eaf57c
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Mar 1 13:37:56 2020 +0100

    Fix broken markup in Xhosa UI translation

 po/xh.po | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/po/xh.po b/po/xh.po
index fcc5a3dc..8a15ff5e 100644
--- a/po/xh.po
+++ b/po/xh.po
@@ -620,7 +620,7 @@ msgstr "*10^"
 
 #: gcalctool/calctool.c:884
 msgid "e<sup><i>x</i></sup>"
-msgstr "e<sup><i>x</i></i></sup>"
+msgstr "e<sup><i>x</i></sup>"
 
 #: gcalctool/calctool.c:885
 msgid "e to the power of displayed value [{]"