fix install dir

Index: translations/Makefile
--- translations/Makefile.orig
+++ translations/Makefile
@@ -15,6 +15,6 @@ $(obj): $(src)
 	$(MSGFMT) -o $@ $<
 
 %.inst: %.mo
-	$(INSTALL) -D -m 644 $< $(DESTDIR)/$(PREFIX)/share/locale/$*/LC_MESSAGES/radeontop.mo
+	$(INSTALL) -D -m 644 $< $(PREFIX)/share/locale/$*/LC_MESSAGES/radeontop.mo
 
 install: all $(inst)
