Ensure trans dir exists when making .mo files

Helps get `make clean && make -j` (parallel build) to work.
h/t bkw @ slackbuilds

Makefile

@@ -4,7 +4,7 @@
 # Various contributors (see AUTHORS.txt)
 # https://tuxpaint.org/
 
-# June 14, 2002 - May 20, 2023
+# June 14, 2002 - May 28, 2023
 
 
 # The version number, for release:
@@ -535,7 +535,7 @@ endif
 
 # Build the translation files for gettext
 
-$(MOFILES): trans/%.mo: src/po/%.po
+$(MOFILES): trans/%.mo: src/po/%.po trans
 	msgfmt -o $@ $<
 
 %.desktop: %.desktop.in $(POTFILES)

docs/CHANGES.txt

@@ -82,6 +82,12 @@ https://tuxpaint.org/
     * Russian translaton
       Olesya Gerasimenko <translation-team@basealt.ru>
 
+  * Ports & Building:
+    -----------------
+    * Ensure `trans` dir. exists, for parallel builds (`make -j`)
+      Bill Kendrick <bill@newbreedsoftware.com>
+      h/t bkw @ slackbuilds
+
 2023.May.18 (0.9.30)
   * Improvements to Stamp tool:
     ---------------------------