Revert Serbian RESETUJ + add per-locale allowlist for identical-to-English hotspots

Uncle 17:40 UTC correction: 'for Serbian actually the issue is that
word is same in English and serbian' - my prior commit b41c40f wrongly
translated Serbian 'RESET' to 'RESETUJ'. Reverted serbian.json back
to 'RESET' = 'RESET'.

To keep validate-packs green AND preserve Uncle's correction, added a
per-locale allowlist to the validator:
- TranslationValidationRules: new LocaleHotspotAllowlist dictionary
  keyed by filename-without-extension (lowercase-insensitive) -> set
  of hotspot keys that legitimately stay identical to English in that
  locale. Seeded with 'serbian' -> {'RESET'}.
- IsShortKeyEnglishFallback gains an optional localeName parameter.
  When provided and the (locale, key) pair is in the allowlist,
  returns false instead of flagging.
- LanguagePackValidator now passes Path.GetFileNameWithoutExtension
  so the rule can short-circuit for legitimate loan-words.

Build clean. validate-packs reports 0 issues: Serbian 'RESET' =
'RESET' no longer flagged; all other locales still checked against
the global hotspot set (so if french.json ever has 'RESET' = 'RESET'
it will still be caught, because french is not in the allowlist).

Design note: the allowlist is intentionally narrow (one entry) rather
than opening the door to broad 'translator said it is fine' entries.
Extending it should be a conscious per-locale decision, not a default.
Co-Authored-By: 1amKhush <khushvendras99@gmail.com>

Services/LanguagePackValidator.cs

@@ -105,7 +105,7 @@ public class LanguagePackValidator
                     continue;
                 }
 
-                if (TranslationValidationRules.IsShortKeyEnglishFallback(key, value))
+                if (TranslationValidationRules.IsShortKeyEnglishFallback(key, value, Path.GetFileNameWithoutExtension(filePath)))
                 {
                     issues.Add(new ValidationIssue(Path.GetFileName(filePath), key, "Common UI label left untranslated (value equals English key)"));
                     if (fix)

Services/TranslationValidationRules.cs

@@ -131,6 +131,14 @@ internal static class TranslationValidationRules
         "More information...",
     };
 
+    // Per-locale exceptions for hotspot keys that legitimately remain identical to the
+    // English key in certain languages (e.g. borrowed words, protocol/brand names used as-is).
+    // Keyed by filename (lowercase, without the .json extension) -> set of allowed identical-to-key entries.
+    private static readonly Dictionary<string, HashSet<string>> LocaleHotspotAllowlist = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ["serbian"] = new(StringComparer.Ordinal) { "RESET" },
+    };
+
     private static readonly HashSet<string> TechnicalAllowTokens = new(StringComparer.OrdinalIgnoreCase)
     {
         "api",
@@ -179,14 +187,26 @@ internal static class TranslationValidationRules
 
     /// <summary>
     /// Detects short, common UI keys (Confirm, Continue, Yes, etc.) that were
-    /// left as English instead of being translated.
+    /// left as English instead of being translated. Accepts an optional locale
+    /// hint so per-locale allowlists can suppress legitimate identical-to-English
+    /// entries (e.g. 'RESET' in Serbian).
     /// </summary>
-    public static bool IsShortKeyEnglishFallback(string key, string value)
+    public static bool IsShortKeyEnglishFallback(string key, string value, string? localeName = null)
     {
         if (!string.Equals(key, value, StringComparison.Ordinal))
             return false;
 
-        return IsShortKeyFallbackHotspot(key);
+        if (!IsShortKeyFallbackHotspot(key))
+            return false;
+
+        if (localeName != null
+            && LocaleHotspotAllowlist.TryGetValue(localeName, out var allowed)
+            && allowed.Contains(key))
+        {
+            return false;
+        }
+
+        return true;
     }
 
     public static bool IsShortKeyFallbackHotspot(string key)

translations/serbian.json

@@ -1464,7 +1464,7 @@
   "Reserved Addresses": "Rezervisane adrese",
   "Reserved At": "Rezervisano",
   "Reset": "Reset",
-  "RESET": "RESETUJ",
+  "RESET": "RESET",
   "Reset app": "Resetuj aplikaciju",
   "Reset authenticator app": "Resetuj authenticator aplikaciju",
   "Reset Boltcard": "Resetuj Boltcard",