feat(web): translations containing html (#10491)

* feat(web): translations containing html

* add tests and more translations

* more translations

* rename FormatTags --> FormatMessage

* update version_announcement_message

web/src/lib/components/i18n/format-message.svelte

@@ -0,0 +1,57 @@
+<script lang="ts">
+  import { IntlMessageFormat, type FormatXMLElementFn, type PrimitiveType } from 'intl-messageformat';
+  import { TYPE, type MessageFormatElement } from '@formatjs/icu-messageformat-parser';
+  import { locale as i18nLocale } from 'svelte-i18n';
+
+  type InterpolationValues = Record<string, PrimitiveType | FormatXMLElementFn<unknown>>;
+
+  export let message: unknown;
+  export let values: InterpolationValues = {};
+
+  const getLocale = (locale?: string | null) => {
+    if (locale == null) {
+      throw new Error('Cannot format a message without first setting the initial locale.');
+    }
+
+    return locale;
+  };
+
+  const getElements = (message: unknown, locale: string): MessageFormatElement[] => {
+    return new IntlMessageFormat(message as string, locale, undefined, {
+      ignoreTag: false,
+    }).getAst();
+  };
+
+  const getParts = (message: unknown, locale: string) => {
+    try {
+      const elements = getElements(message, locale);
+
+      return elements.map((element) => {
+        const isTag = element.type === TYPE.tag;
+
+        return {
+          tag: isTag ? element.value : undefined,
+          message: new IntlMessageFormat(isTag ? element.children : [element], locale, undefined, {
+            ignoreTag: true,
+          }).format(values) as string,
+        };
+      });
+    } catch (error) {
+      if (error instanceof Error) {
+        console.warn(`Message "${message}" has syntax error:`, error.message);
+      }
+      return [{ message: message as string, tag: undefined }];
+    }
+  };
+
+  $: locale = getLocale($i18nLocale);
+  $: parts = getParts(message, locale);
+</script>
+
+{#each parts as { tag, message }}
+  {#if tag}
+    <slot {tag} {message}>{message}</slot>
+  {:else}
+    {message}
+  {/if}
+{/each}