Use make functions for HELP_LINGUAS

Author: rbuj

help/Makefile.am

@@ -16,5 +16,8 @@ HELP_MEDIA = figures/addColumn.png \
 	      figures/systemMonitor.png \
 	      figures/viewMenu.png
 
-HELP_LINGUAS = ar bg ca cs da de el es fr oc pa sv zh_CN
-
+# Add linguas to be ignored, e.g. IGNORE_HELP_LINGUAS = ca de es fr
+IGNORE_HELP_LINGUAS =
+HELP_LINGUAS = $(if $(IGNORE_HELP_LINGUAS), \
+	$(filter-out $(IGNORE_HELP_LINGUAS),$(subst /,,$(dir $(wildcard */*.po)))), \
+	$(subst /,,$(dir $(wildcard */*.po))) )