apps/contrib/*: add HoverButton and helper for dates

apps/contrib/assets/HoverButton.jsx

@@ -0,0 +1,37 @@
+import React, { useState, useEffect } from 'react'
+
+export const HoverButton = (props) => {
+  const { textMouseOn, textMouseOff, onClick } = props
+  const [buttonText, setButtonText] = useState(textMouseOff)
+  const [processing, setProcessing] = useState(false)
+
+  const handleClick = () => {
+    setProcessing(true)
+    onClick()
+  }
+
+  useEffect(() => {
+    setProcessing(false)
+    setButtonText(textMouseOff)
+  }, [textMouseOff])
+
+  return (
+    <button
+      id={props.id}
+      className={props.className}
+      type="button"
+      onClick={handleClick}
+      disabled={processing || props.disabled}
+      onMouseEnter={() => setButtonText(textMouseOn)}
+      onMouseLeave={() => setButtonText(textMouseOff)}
+      onFocus={() => setButtonText(textMouseOn)}
+      onBlur={() => setButtonText(textMouseOff)}
+      aria-label={buttonText}
+    >
+      {props.icon}
+      <span className="ms-1">
+        {buttonText}
+      </span>
+    </button>
+  )
+}

apps/contrib/assets/__tests__/HoverButton.jest.jsx

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+import React from 'react'
+import { render, screen, fireEvent } from '@testing-library/react'
+import '@testing-library/jest-dom'
+import { HoverButton } from '../HoverButton'
+
+test('Show button with normal text', () => {
+  render(
+    <HoverButton
+      textMouseOff="activated"
+    />
+  )
+  expect(screen.getByText('activated')).toBeInTheDocument()
+})
+
+test('Show button with hover text, via mouse', () => {
+  render(
+    <HoverButton
+      textMouseOn="deactivate"
+      textMouseOff="activated"
+    />
+  )
+  fireEvent.mouseOver(screen.getByText('activated'))
+  expect(screen.getByText('deactivate')).toBeInTheDocument()
+  fireEvent.mouseOut(screen.getByText('deactivate'))
+  expect(screen.getByText('activated')).toBeInTheDocument()
+})
+
+test('Show button with hover text, via keyboard', () => {
+  render(
+    <HoverButton
+      textMouseOn="deactivate"
+      textMouseOff="activated"
+    />
+  )
+  fireEvent.focus(screen.getByText('activated'))
+  expect(screen.getByText('deactivate')).toBeInTheDocument()
+  fireEvent.blur(screen.getByText('deactivate'))
+  expect(screen.getByText('activated')).toBeInTheDocument()
+})
+
+test('Show button with normal text and click on button', () => {
+  const onChangeFn = jest.fn()
+  render(
+    <HoverButton
+      textMouseOn="deactivate"
+      textMouseOff="activated"
+      onClick={onChangeFn}
+    />
+  )
+  expect(screen.getByText('activated')).toBeInTheDocument()
+  fireEvent.click(screen.getByText('activated'))
+  expect(onChangeFn).toHaveBeenCalled()
+})

apps/contrib/dates.py

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+from django.template import defaultfilters
+from django.utils import timezone
+
+
+def get_date_display(date):
+    local_date = timezone.localtime(date)
+    return '{}, {}'.format(defaultfilters.date(local_date),
+                           defaultfilters.time(local_date))