Looks good. Haven't played too much but glad to see 508 being addressed.

The console is giving me uncaught TypeErrors with each page. Looks like one of the jquery or js calls is out of sequence. Sorry, not much time to investigate.
Code:
(anonymous) @ index.php?main_page=index:345foundation.abide.js:103
Uncaught TypeError: Cannot read property 'Plugin' of undefined
    at Object.2 (foundation.abide.js:103)
    at __webpack_require__ (foundation.abide.js:20)
    at Object.43 (foundation.abide.js:114)
    at __webpack_require__ (foundation.abide.js:20)
    at Object.13 (foundation.abide.js:92)
    at __webpack_require__ (foundation.abide.js:20)
    at Object.79 (foundation.abide.js:776)
    at __webpack_require__ (foundation.abide.js:20)
    at 0.module.exports (foundation.abide.js:66)
    at foundation.abide.js:69
2 @ foundation.abide.js:103
__webpack_require__ @ foundation.abide.js:20
43 @ foundation.abide.js:114
__webpack_require__ @ foundation.abide.js:20
13 @ foundation.abide.js:92
__webpack_require__ @ foundation.abide.js:20
79 @ foundation.abide.js:776
__webpack_require__ @ foundation.abide.js:20
0.module.exports @ foundation.abide.js:66
(anonymous) @ foundation.abide.js:69
mycontentscript.js:13 KGen:Page => Ready !
Also, is it possible to drop the line-height:0 call for .thumbnail in the foundation.min.css file? I don't see any problem deleting it but, it's presence causes alt information to be on a single line. This means that long alt tags will overwrite themselves. Don't know the effect on SEs reading or readers for those with vision difficulties but, it does not seem to bother anything else that I can find and removing line-height:0 makes all alt tags legible in the browser.