doc/po/Makefile: build only fully-translated manual pages.

doc/changelog

@@ -21,6 +21,7 @@ pdf2djvu (0.9) UNRELEASED; urgency=low
   * Improve error handling.
   * Improve the test suite.
   * Update the Polish translation.
+  * Disable building the Ukrainian manual page, which is not fully translated.
 
   [ Américo Monteiro ]
   * Update the Portuguese translation.
@@ -34,7 +35,7 @@ pdf2djvu (0.9) UNRELEASED; urgency=low
   [ Kyrill Detinov ]
   * Update the Russian translation.
 
- -- Jakub Wilk <[email protected]>  Sun, 27 Sep 2015 13:34:32 +0200
+ -- Jakub Wilk <[email protected]>  Sun, 27 Sep 2015 17:21:49 +0200
 
 pdf2djvu (0.8.2) unstable; urgency=low
 

doc/po/Makefile

@@ -53,7 +53,7 @@ man_files = $(addsuffix .1,$(addprefix pdf2djvu.,$(langs)))
 all: $(man_files)
 
 pdf2djvu.%.1: %.xml
-	$(srcdir)/tools/build-manpage --lang $(<) $(@)
+	! [ -s $(<) ] || $(srcdir)/tools/build-manpage --lang $(<) $(@)
 
 .PHONY: xml
 xml: $(xml_files)
@@ -66,7 +66,7 @@ $(po_files): %.po: $(source)
 	touch $(@)
 
 %.xml: %.po
-	$(po4a-translate) -m $(source) -p $(<) -l $(@)
+	$(po4a-translate) -k 100 -m $(source) -p $(<) -l $(@)
 
 .PHONY: check
 check: $(po_files)