add support for songbook language in patacrep template

templates/patacrep.tmpl

@@ -40,7 +40,8 @@
 %%:  {"name":"mainfontsize", "description":"Font Size", "type":"font", "default":"10"},
 %%:  {"name":"songnumberbgcolor", "description":"Number Shade", "type":"color", "default":"#D1E4AE"},
 %%:  {"name":"notebgcolor", "description":"Note Shade", "type":"color", "default":"#D1E4AE"},
-%%:  {"name":"indexbgcolor", "description":"Index Shade", "type":"color", "default":"#D1E4AE"}
+%%:  {"name":"indexbgcolor", "description":"Index Shade", "type":"color", "default":"#D1E4AE"},
+%%:  {"name":"lang", "description":"Language", "default":"french"}
 %%:]
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % begin document
@@ -60,6 +61,7 @@
 \picturecopyright{\getpicturecopyright}
 \footer{\getfooter}
 \licence{\getlicense}
+\lang{\getlang}
 
 \newindex{titleidx}{\getname_title}
 \newauthorindex{authidx}{\getname_auth}