[balsa] Add Czech language for help

[Marek Černocký <mcernocky src gnome org>]

commit 6519d9c3c42100475402d9d20db76a14bfbca709
Author: Marek Černocký <marek manet cz>
Date:   Tue Nov 24 23:04:02 2015 +0100

    Add Czech language for help

 doc/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 7f6ece8..ca997db 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -21,7 +21,7 @@ DOC_FIGURES = figures/address-book-ldap.png                   \
              figures/newmsg-window-toolbar.png                 \
              figures/preferences-window.png                    \
              figures/spell-check.png
-DOC_LINGUAS = de el es fr sl
+DOC_LINGUAS = cs de el es fr sl
 else
 # gnome-doc-utils is not obligatory but the old documentation style
 # is not supported any more.