fix: add legacy translation support in Auto Translate Cached Only option (#742)

# 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
This PR introduces fix: add legacy translation support in Auto Translate
Cached Only option

src/lang/en.ts

@@ -170,7 +170,7 @@ export const languageEnglish = {
         summarizationPrompt: "The prompt that is used for summarization. if it is blank, it will use the default prompt. you can also use ChatML formating with {{slot}} for the chat data.",
         translatorPrompt: "The prompt that is used for translation. if it is blank, it will use the default prompt. you can also use ChatML formating with {{slot}} for the dest language, {{solt::content}} for the content, and {{slot::tnote}} for the translator note.",
         translateBeforeHTMLFormatting: "If enabled, it will translate the text before Regex scripts and HTML formatting. this could make the token lesser but could break the formatting.",
-        autoTranslateCachedOnly: "If enabled, it will automatically translate only the text that the user has translated previously.",
+        autoTranslateCachedOnly: "If enabled with Auto Translation option on, it will automatically translate only the text that the user has translated previously.",
         presetChain: "If it is not blank, the preset will be changed and applied randomly every time when user sends a message in the preset list in this input. preset list should be seperated by comma, for example, `preset1,preset2`.",
         legacyMediaFindings: "If enabled, it will use the old method to find media assets, without using the additional search algorithm.",
         comfyWorkflow: "Put the API workflow of comfy UI. you can get your API workflow in comfy UI by pressing the 'Workflow > Export (API)' button. you must also put {{risu_prompt}} in you workflow text. the {{risu_prompt}} will be replaced with the prompt provided by the Risu.",

src/lib/ChatScreens/Chat.svelte

@@ -143,7 +143,9 @@
                         if(DBState.db.autoTranslateCachedOnly && DBState.db.translatorType === 'llm'){
                             const cache = DBState.db.translateBeforeHTMLFormatting
                             ? await getLLMCache(data)
-                            : await getLLMCache(await ParseMarkdown(data, charArg, 'pretranslate', chatID, getCbsCondition()))
+                            : !DBState.db.legacyTranslation
+                            ? await getLLMCache(await ParseMarkdown(data, charArg, 'pretranslate', chatID, getCbsCondition()))
+                            : await getLLMCache(await ParseMarkdown(data, charArg, mode, chatID, getCbsCondition()))
                   
                             translateText = cache !== null
                         }