feat(usage): add i18n strings for the Usage page

Menu label (Usage) and the resource-tab strings (filters, export
chart/table, table headers) across all five locales.

src/locales/ja-JP/menu.ts

@@ -26,6 +26,9 @@ export default {
   'menu.profile': 'Preferences',
   'menu.login': 'ログイン',
   'menu.usage': '使用状況',
+  'menu.usage.usage': '使用状況',
+  'menu.billingAndUsage': '請求と使用状況',
+  'menu.billingAndUsage.usage': '使用状況',
   'menu.404': '404',
   'menu.settings': 'Settings',
   'menu.resources.workers': 'Workers',

src/locales/ja-JP/usage.ts

@@ -17,6 +17,7 @@ export default {
   'usage.table.user.apiKeysUsed': 'API Keys Used',
   'usage.table.lastActive': 'Last Active',
   'usage.filter.granularity': 'Granularity',
+  'usage.filter.granularity.hour': '時間',
   'usage.filter.granularity.day': 'Day',
   'usage.filter.granularity.week': 'Week',
   'usage.filter.granularity.month': 'Month',