[chronojump] Minor fix (1 string) on Spanish translation

[Xavier de Blas <xaviblas src gnome org>]

commit bee9a4bae6c105ace363b58432527199321444a9
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Oct 4 14:09:38 2021 +0200

    Minor fix (1 string) on Spanish translation

 po/es.po | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/po/es.po b/po/es.po
index 53b207d28..d4eaf6e2c 100644
--- a/po/es.po
+++ b/po/es.po
@@ -4563,7 +4563,7 @@ msgstr "Condiciones"
 
 #: ../glade/repetitive_conditions.glade.h:15
 msgid "Main variable"
-msgstr "Variables principal"
+msgstr "Variable principal"
 
 #: ../glade/repetitive_conditions.glade.h:16
 msgid "Feedback relative to the maximum repetition of …"