raidemulator: fix inconsistent ParserLanguage (#920)

`ParserLanguage` should depend on the result of `browserLanguagesToLang`
when the user is **not** connected to WebSocket.

Feature initially implemented in quisquous#2970. 

Changes in quisquous#3029 set the default behavior to `en`, making the `if
(enc.language)` condition always evaluate to `true`.

---


[ui\raidboss\emulator\data\Encounter.ts#L46](https://github.com/OverlayPlugin/cactbot/blob/main/ui/raidboss/emulator/data/Encounter.ts#L46)

```typescript
  language: Lang = 'en'; // ← this
```

---

Not sure about potential side effects; would appreciate a review from
@valarnin.



---

**Added**: This also fixes an issue where `setCurrent` incorrectly calls
`setParserLanguage("en")` when `enc.language` is not defined within the
log segment.

Author: Souma-Sumire

ui/raidboss/emulator/data/RaidEmulator.ts

@@ -35,7 +35,7 @@ export default class RaidEmulator extends EventBus {
   ): void {
     // If language was autodetected from the encounter, set the current ParserLanguage
     // appropriately
-    if (enc.language) {
+    if (enc.language !== 'en') {
       this.options.ParserLanguage = enc.language;
       this.popupText?.setParserLanguage(enc.language);
     }