Enable translation of autocomplete strings

[shawnbot]

💣 ⚠️ The shouldSort: true option default is gone in this PR. You can add {"shouldSort": true} to the custom options of your component to sort the items alphabetically.

This PR enables translation of all the strings that can be configured via a select component's "custom options" JSON to control what shows up in Choices.js under certain conditions. There is a new autocomplete example that you can give ?language=debug in the query string to see the keys in context.

key	English	Choices option	notes
autocomplete.searchPlaceholderValue	"Type to search"	searchPlaceholderValue	The placeholder text of the search input
autocomplete.noResultsText	"No results found"	noResultsText
autocomplete.itemSelectText	none	itemSelectText	Displayed on the right side of the dropdown alongside the currently highlighted option
autocomplete.maxItemText	"Only {{count}} values can be added"	maxItemText	The {{count}} placeholder is substituted with the maxItemCount option.
autocomplete.noChoicesText	"No choices to choose from"	noChoicesText	This should only show up if we haven't provided any static options or have a dynamic select driven by an API that doesn't return any results.
autocomplete.addItemText	none	addItemText	⚠️ I think that this option is only applicable when freeform values are allowed. If so, this shows up when you've typed a search string as a prompt, e.g. "Press Enter to add {{value}}", where {{value}} is substituted with the "backend" value of the option.

Each of the translation keys above can be prefixed with the component key and a . to customize the strings for that component only. For instance, yourJob.autocomplete.searchPlaceholderValue might have an English translation of "Type to search common jobs".

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[github-actions[bot]]

Size Change: +492 B (+1%)

Total Size: 89.2 kB

Filename	Size	Change
dist/formio-sfds.standalone.js	69.5 kB	+492 B (+1%)

ℹ️ View Unchanged

| Filename | Size | Change | | :--- | :---: | :---: | | `dist/common.css` | 332 B | 0 B | | `dist/formio-sfds.css` | 14 kB | 0 B | | `dist/portal.js` | 5.36 kB | 0 B |

_{compressed-size-action}

[shawnbot]

Docs for this are going into the 7.2.0 release in #176.