squash-me: Use Makefile instead of build.sh.

docs/Makefile

@@ -7,16 +7,28 @@ SPHINXBUILD   = sphinx-build
 SOURCEDIR     = .
 BUILDDIR      = _build
 
+LOCALES       = $$(echo $(wildcard locales/??) | sed s@locales/@@g)
+POT_DIR       = _build/gettext
+
 # Put it first so that "make" without argument is like "make help".
 help:
 	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
 .PHONY: help Makefile
 
 clean:
-	rm -fr _build/??
+	rm -fr $(BUILDDIR)/??
 	rm -f locales/??/LC_MESSAGES/*.mo
 
+pot_merge_po: gettext
+	@LANG_OPTS=$$(echo $(LOCALES) | sed -E 's@([[:alpha:]]*)*@-l \1@g'); \
+	sphinx-intl update -p "${POT_DIR}" $${LANG_OPTS}
+
+doc: clean
+	@for lang in $(LOCALES); \
+		do make -e SPHINXOPTS="-D language=$${lang}" -e BUILDDIR="_build/$${lang}" rst; \
+	done
+
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile