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/ResourceItemDropdown.tsx

@@ -39,8 +39,8 @@ const ResourceItemDropdown = ({ resource }: Props) => {
 
   const handleResetResourceLinkBtnClick = (resource: Resource) => {
     showCommonDialog({
-      title: "Reset resource link",
-      content: "Are you sure to reset the resource link?",
+      title: t("resource.reset-resource-link"),
+      content: t("resource.reset-link-prompt"),
       style: "warning",
       dialogName: "reset-resource-link-dialog",
       onConfirm: async () => {
@@ -75,7 +75,7 @@ const ResourceItemDropdown = ({ resource }: Props) => {
 
   return (
     <Dropdown
-      actionsClassName="!w-28"
+      actionsClassName="!w-auto min-w-[8rem]"
       trigger={<Icon.MoreVertical className="w-4 h-auto hover:opacity-80 cursor-pointer" />}
       actions={
         <>
@@ -95,7 +95,7 @@ const ResourceItemDropdown = ({ resource }: Props) => {
             className="w-full text-left text-sm leading-6 py-1 px-3 cursor-pointer rounded hover:bg-gray-100 dark:hover:bg-zinc-600"
             onClick={() => handleResetResourceLinkBtnClick(resource)}
           >
-            Reset link
+            {t("resource.reset-link")}
           </button>
           <button
             className="w-full text-left text-sm leading-6 py-1 px-3 cursor-pointer rounded hover:bg-gray-100 dark:hover:bg-zinc-600"