feat: improve i18n support as a whole (#1526)

* feat: improve i18n support as a whole

- Remove dayjs in favor of /helpers/datetime.ts, which uses
Intl.DateTimeFormat and Date. Dayjs is not exactly i18n friendly
and has several locale related opened issues.

- Move/refactor date/time code from /helpers/utils.ts to
/helpers/datetime.ts.

- Fix Daily Review weekday not changing according to selected date.

- Localize Daily review weekday and month.

- Load i18n listed strings from /locales/{locale}.json in a dynamic way.
This makes much easier to add new locales, by just adding a properly
named json file and listing it only in /web/src/i18n.ts and
/api/user_setting.go.

- Fallback languages are now set in /web/src/i18n.ts.

- Full language codes are now preffered, but they fallback to 2-letter
codes when not available.

- The locale dropdown is now populated dynamically from the available
locales. Locale names are populated by the browser via
Intl.DisplayNames(locale).

- /web/src/i18n.ts now exports a type TLocale from availableLocales
array. This is used only by findNearestLanguageMatch(). As I was unable
to use this type in ".d.ts" files, I switched the Locale type from
/web/src/types/i18n.d.ts to string.

- Move pretty much all hardcoded text strings to i18n strings.

- Add pt-BR translation.

- Remove site.ts and move its content to a i18n string.

- Rename zh.json to zh-Hans.json to get the correct language name on
selector dropdown.

- Remove pt_BR.json and replace with pt-BR.json.

- Some minor layout spacing fixes to accommodate larger texts.

- Improve some error messages.

* Delete .yarnrc.yml

* Delete package-lock.json

* fix: 158:28  error  Insert `⏎`  prettier/prettier

web/src/components/UpdateAccountDialog.tsx

@@ -146,17 +146,17 @@ const UpdateAccountDialog: React.FC<Props> = ({ destroy }: Props) => {
         </div>
         <p className="text-sm">
           {t("common.username")}
-          <span className="text-sm text-gray-400 ml-1">(Using to sign in)</span>
+          <span className="text-sm text-gray-400 ml-1">{t("setting.account-section.username-note")}</span>
         </p>
         <input type="text" className="input-text" value={state.username} onChange={handleUsernameChanged} />
         <p className="text-sm">
           {t("common.nickname")}
-          <span className="text-sm text-gray-400 ml-1">(Display in the banner)</span>
+          <span className="text-sm text-gray-400 ml-1">{t("setting.account-section.nickname-note")}</span>
         </p>
         <input type="text" className="input-text" value={state.nickname} onChange={handleNicknameChanged} />
         <p className="text-sm">
           {t("common.email")}
-          <span className="text-sm text-gray-400 ml-1">(Optional)</span>
+          <span className="text-sm text-gray-400 ml-1">{t("setting.account-section.email-note")}</span>
         </p>
         <input type="text" className="input-text" value={state.email} onChange={handleEmailChanged} />
         <div className="pt-2 w-full flex flex-row justify-end items-center space-x-2">