Add Firefox(Bergamot) local translation (#794)

# PR Checklist
- [ ] Have you checked if it works normally in all models? *Ignore this
if it doesn't use models.*
- [ ] Have you checked if it works normally in all web, local, and node
hosted versions? If it doesn't, have you blocked it in those versions?
- [ ] Have you added type definitions?

# Description
Translation is performed using the models hosted in the repository:
https://github.com/mozilla/firefox-translations-models/

When the translation is first running, the model is downloaded from the
repository.

Testing completed for `npm dev` and Node server environment.

src/lib/Setting/Pages/LanguageSettings.svelte

@@ -90,6 +90,7 @@
         <OptionInput value="deepl" >DeepL</OptionInput>
         <OptionInput value="llm" >Ax. Model</OptionInput>
         <OptionInput value="deeplX" >DeepL X</OptionInput>
+        <OptionInput value="bergamot" >Firefox</OptionInput>
     </SelectInput>
 
     {#if DBState.db.translatorType === 'deepl'}
@@ -135,6 +136,11 @@
         </SelectInput>
     {/if}
 
+    {#if DBState.db.translatorType === 'bergamot'}
+        <div class="flex items-center mt-4">
+            <Check bind:check={DBState.db.htmlTranslation} name={language.htmlTranslation}/>
+        </div>
+    {/if}
 
     <div class="flex items-center mt-2">
         <Check bind:check={DBState.db.autoTranslate} name={language.autoTranslation}/>