Edit:
Yes there's a way:
You can create a javascript function that takes the path as a parameter and creates these HTML lines:
<script src="js/datepicker-in-all-languages/datepicker-af.js"></script>
<script src="js/datepicker-in-all-languages/datepicker-ar-DZ.js"></script>
<script src="js/datepicker-in-all-languages/datepicker-ar.js"></script>
...................and for all other 30 languages................
And you'll just have to call this:
loadLib("datepicker-in-all-languages/datepicker-af");
loadLib("datepicker-in-all-languages/datepicker-ar-DZ");
loadLib("datepicker-in-all-languages/datepicker-ar");
Edit:
Also take a loot at Grunt which is meant for the same purpose.You can setup grunt to watch the folder of the scripts and concat/minify them into a single file, then you just have to include that in your HTML file.:
GRuntJS usage(According to their official page): With literally hundreds of plugins to choose from, you can use Grunt
to automate just about anything with a minimum of effort.
Edit:
There is also a minified file of jQuery ui i18n which is being hosted by google. You can use it in single <script>
tag : http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.1/i18n/jquery-ui-i18n.min.js . I found it in answers here here.