More mobile tweaks (#790)

* Disable text selection

* Set content-editable=plaintext-only to disable Touch Bar formatting buttons

* Enlarge resize handle tap targets for pen/touch

* Make the lock button a button in mobile mode

* Use icons instead of Unicode characters; add an alternate toolbar for creating multipoint lines

* Allow buttons to hide themselves

* Fix heuristic for showing shape actions

* Refactor icons

* Fix label for edit button

* Switch edit button icon

* Remove lock button on mobile

* Add language selector on mobile

* Fix showing edit button on mobile

* Fix showing edit button on mobile, part 2

* Fix handle touch regions

* Fix scroll-back button position

* Allow using the text tool on a text object to start editing it

* Fix deletion of last point in line

src/components/LanguageList.tsx

@@ -5,15 +5,19 @@ export function LanguageList<T>({
   onChange,
   languages,
   currentLanguage,
+  floating,
 }: {
   languages: { lng: string; label: string }[];
   onChange: (value: string) => void;
   currentLanguage: string;
+  floating?: boolean;
 }) {
   return (
     <React.Fragment>
       <select
-        className="language-select"
+        className={`dropdown-select dropdown-select__language${
+          floating ? " dropdown-select--floating" : ""
+        }`}
         onChange={({ target }) => onChange(target.value)}
         value={currentLanguage}
         aria-label={t("buttons.selectLanguage")}