add contributor

README.MD

@@ -247,6 +247,7 @@ See https://github.com/gildas-lormeau/SingleFile/blob/master/privacy.md
   lqzhgood (https://github.com/lqzhgood)
 - Traditional Chinese translation done by frostblazergit
   (https://github.com/frostblazergit), lqzhgood (https://github.com/lqzhgood)
+- Dutch translation done by jooleer (https://github.com/jooleer)
 - German translation done by womotroll (https://github.com/womotroll), bannmann
   (https://github.com/bannmann)
 - Italian translation done by Fastbyte01 (https://github.com/Fastbyte01)

src/ui/pages/help.html

@@ -1226,6 +1226,10 @@
 					<li>Traditional Chinese translation done by frostblazergit (<a
 							href="https://github.com/frostblazergit" target="_blank">GitHub profile</a>), lqzhgood (<a
 							href="https://github.com/lqzhgood" target="_blank">GitHub profile</a>)</li>
+					<li>Dutch translation done by jooleer (<a href="https://github.com/jooleer" target="_blank">GitHub
+							profile</a>)</li>
+					<li>Dutch translation done by jooleer (<a href="https://github.com/jooleer" target="_blank">GitHub
+							profile</a>)</li>
 					<li>German translation done by womotroll (<a href="https://github.com/womotroll"
 							target="_blank">GitHub profile</a>), bannmann (<a href="https://github.com/bannmann"
 							target="_blank">GitHub profile</a>) </li>