refs #15632 [fid_adlr] initial commit for new design

* New Adlr header design
** initial implementation of SCSS structure
** initial implementation of basic fonts (icon font still missing)
** initial commit of basic images for header
** initial template customizations to accomodate new header design and behavior

* improves LG look (not yet complete)
* adds category icons folder
* adds initial translations

themes/fid_adlr/images/category-icons/image-offline.svg

+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="57px" height="51px" viewBox="0 0 57 51" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 54.1 (76490) - https://sketchapp.com -->
+    <title>image offline</title>
+    <desc>Created with Sketch.</desc>
+    <g id="Category-Icons" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Icons" transform="translate(-73.000000, -937.000000)" fill="#2BEDCA" fill-rule="nonzero">
+            <g id="image-offline" transform="translate(73.000000, 937.000000)">
+                <path d="M3,0 L54,0 C55.6568542,-3.04359188e-16 57,1.34314575 57,3 L57,48 C57,49.6568542 55.6568542,51 54,51 L3,51 C1.34314575,51 2.02906125e-16,49.6568542 0,48 L0,3 C-2.02906125e-16,1.34314575 1.34314575,3.04359188e-16 3,0 Z M3,3 L3,48 L54,48 L54,3 L3,3 Z" id="Rectangle"></path>
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+                <path d="M32.2149204,34.749996 C32.8007353,35.335754 33.7504827,35.3357079 34.3362407,34.7498931 C34.9219987,34.1640782 34.9219526,33.2143307 34.3361378,32.6285727 L24.6903383,22.9837095 C23.7651584,22.0586195 22.2831987,22.0033188 21.2916467,22.8568842 L5.0219228,36.8624775 C4.39408173,37.4029469 4.32325294,38.3500496 4.86372227,38.9778907 C5.40419159,39.6057317 6.3512943,39.6765605 6.97913537,39.1360912 L22.8972211,25.4332012 L32.2149204,34.749996 Z" id="Path-4"></path>
+                <path d="M50.7936709,28.8411024 C51.4375344,29.3623809 52.3820686,29.2630061 52.9033471,28.6191426 C53.4246256,27.975279 53.3252508,27.0307448 52.6813873,26.5094663 L40.7102212,16.8174878 C39.712548,16.0097615 38.2652721,16.0888803 37.3615938,17.0005486 L27.0527466,27.4005431 C26.4695441,27.9889021 26.4737243,28.9386403 27.0620833,29.5218428 C27.6504423,30.1050454 28.6001805,30.1008652 29.1833831,29.5125062 L39.1739217,19.4336347 L50.7936709,28.8411024 Z" id="Path-4-Copy"></path>
+            </g>
+        </g>
+    </g>
+</svg>
\ No newline at end of file