refs #21417 [fid_adlr] w3c validation

* start page
** <meta name="description"> only once - language check
** remove tabindex="-1" on search button's inner span

* result list
** Element form not allowed as child of element span in this context -> search controls sort and pages
** an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value. -> added quote in result grouping template
** Element a not allowed as child of element ul in this context. (Suppressing further errors from this subtree.) -> facet-lists more / less links within li (from finc-accessibility theme)
** Element div not allowed as child of element ul in this context. (Suppressing further errors from this subtree.) -> date range slider facet as li (+ additional styling)
** The select element cannot have more than one selected option descendant unless the multiple attribute is specified. -> remove selected attribute from disabled option for limit and sort in offcanvas
** Attribute maxlength is only allowed when the input type is email, password, search, tel, text, or url. -> reuse finc version for date range slider (max instead of maxlength)

* details view
** Element p not allowed as child of element h3 in this context. (Suppressing further errors from this subtree.) -> subtitle as span instead of p
** Duplicate ID toolbar-menu. -> remove second
** Element ul not allowed as child of element span in this context. (Suppressing further errors from this subtree.) -> span to div
** Attribute href not allowed on element button at this point. -> href to data-target
** Get-It-Box: #get-it-button / Ressources-Button (/Record/0-725915765)
** RecordTabs: #side-collapse-... (/Record/0-725915765)
** Bad value >>side-panel-Table of Contents<< for attribute id on element div: An ID must not contain whitespace. -> RecordTabs: use $tab instead $desc for construct ID in core-templates (but IDs are not really in use, IDs used just for styling)

* result list (active filters)
** Duplicate ID applied_filter_1 -> in searchbox.phtml applied filter were rendered twice
** Attribute href not allowed on element button at this point. -> href to data-target
** toggle button facet group
** End tag ul seen, but there were open elements. -> moving endif (closing div and li was missed before); problem only if filters are active

* date range slider
** revert design changes of ticket 22462
** add up & down Arrows again by using input type=number

* result list advanced search
** No p element in scope but a p end tag seen. -> remove falsely added closing p

co-authored by: Robert Lange <robert.lange@uni-leipzig.de>
* add missing closing div in view