fix(costs): row buttons, settle-up rows and share toggles say what they are about to a screen reader

A screen reader lists a page's buttons together, and the costs views gave
it twenty "Edit" and "Delete" buttons with nothing to tell them apart.

- Edit and delete on an expense name the expense ("Edit: Dinner"), edit
  and undo on a payment name who paid whom, on desktop and phone.
- A settle-up row shows only initials in its avatars, its names lived in a
  tooltip; the row now carries them for assistive tech too, and its Settle
  button says who pays whom and how much.
- The search field of every searchable select (currency, time zone,
  category) was read out as "..."; it now says Search in the user's
  language.
- The public link toggles on the phone share sheet and the journey share
  toggles say whether they are on (aria-pressed), not only by colour.
- Japanese still said "you" in the settle-up lines.

Refs #2604

shared/src/i18n/ja/budget.ts

@@ -42,7 +42,7 @@ const budget: TranslationStrings = {
   'budget.categoriesLabel': 'カテゴリ',
   'costs.you': '自分',
   'costs.youShort': 'Y',
-  'costs.youLower': 'you',
+  'costs.youLower': '自分',
   'costs.youOwe': '支払う額',
   'costs.youOweSub': '他の人に支払うべき額',
   'costs.youreOwed': '受け取る額',