diff --git a/res/flags/gr.svg b/res/flags/el.svg
similarity index 53%
rename from res/flags/gr.svg
rename to res/flags/el.svg
index 1a5f1b71c..532046f61 100644
--- a/res/flags/gr.svg
+++ b/res/flags/el.svg
@@ -1,4 +1,5 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 27 18">
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="600" height="400" viewBox="0 0 27 18">
 <rect fill="#0D5EAF" width="27" height="18"/>
 <path fill="none" stroke-width="2" stroke="#FFF" d="M5,0V11 M0,5H10 M10,3H27 M10,7H27 M0,11H27 M0,15H27"/>
-</svg>
+</svg>
\ No newline at end of file
diff --git a/test/unit/utils/flagValidation.test.ts b/test/unit/utils/flagValidation.test.ts
new file mode 100644
index 000000000..53a141b91
--- /dev/null
+++ b/test/unit/utils/flagValidation.test.ts
@@ -0,0 +1,95 @@
+import { expect } from 'chai'
+import { readdirSync } from 'fs'
+import { join } from 'path'
+
+describe('Flag Validation', () => {
+  it('should validate that all flag files have valid ISO-639-1 language codes or ISO-639-1 with country codes', () => {
+    // Valid ISO-639-1 language codes
+    const iso639_1Codes = new Set([
+      'aa', 'ab', 'ae', 'af', 'ak', 'am', 'an', 'ar', 'as', 'av', 'ay', 'az',
+      'ba', 'be', 'bg', 'bh', 'bi', 'bm', 'bn', 'bo', 'br', 'bs', 'ca', 'ce',
+      'ch', 'co', 'cr', 'cs', 'cu', 'cv', 'cy', 'da', 'de', 'dv', 'dz', 'ee',
+      'el', 'en', 'eo', 'es', 'et', 'eu', 'fa', 'ff', 'fi', 'fj', 'fo', 'fr',
+      'fy', 'ga', 'gd', 'gl', 'gn', 'gu', 'gv', 'ha', 'he', 'hi', 'ho', 'hr',
+      'ht', 'hu', 'hy', 'hz', 'ia', 'id', 'ie', 'ig', 'ii', 'ik', 'io', 'is',
+      'it', 'iu', 'ja', 'jv', 'ka', 'kg', 'ki', 'kj', 'kk', 'kl', 'km', 'kn',
+      'ko', 'kr', 'ks', 'ku', 'kv', 'kw', 'ky', 'la', 'lb', 'lg', 'li', 'ln',
+      'lo', 'lt', 'lu', 'lv', 'mg', 'mh', 'mi', 'mk', 'ml', 'mn', 'mr', 'ms',
+      'mt', 'my', 'na', 'nb', 'nd', 'ne', 'ng', 'nl', 'nn', 'no', 'nr', 'nv',
+      'ny', 'oc', 'oj', 'om', 'or', 'os', 'pa', 'pi', 'pl', 'ps', 'pt', 'qu',
+      'rm', 'rn', 'ro', 'ru', 'rw', 'sa', 'sc', 'sd', 'se', 'sg', 'si', 'sk',
+      'sl', 'sm', 'sn', 'so', 'sq', 'sr', 'ss', 'st', 'su', 'sv', 'sw', 'ta',
+      'te', 'tg', 'th', 'ti', 'tk', 'tl', 'tn', 'to', 'tr', 'ts', 'tt', 'tw',
+      'ty', 'ug', 'uk', 'ur', 'uz', 've', 'vi', 'vo', 'wa', 'wo', 'xh', 'yi',
+      'yo', 'za', 'zh', 'zu'
+    ])
+
+    // Valid ISO-3166-1 alpha-2 country codes (subset that makes sense for language variants)
+    const countryCodePattern = /^[A-Z]{2}$/
+
+    const flagsDir = join(__dirname, '../../../res/flags')
+    const flagFiles = readdirSync(flagsDir).filter(file => file.endsWith('.svg'))
+
+    const invalidFiles: string[] = []
+    const validSpecialCases = new Set([
+      'unknown.svg', // Special case for unknown languages
+      'eu.svg',      // European Union (not a country but widely used)
+      'eo.svg'       // Esperanto (constructed language with ISO-639-1 code)
+    ])
+
+    for (const file of flagFiles) {
+      const filename = file.replace('.svg', '')
+      
+      // Skip special cases
+      if (validSpecialCases.has(file)) {
+        continue
+      }
+
+      let isValid = false
+
+      // Check if it's a valid ISO-639-1 code
+      if (iso639_1Codes.has(filename)) {
+        isValid = true
+      }
+      // Check if it's ISO-639-1 + country code (e.g., "en-US", "zh-CN")
+      else if (filename.includes('-')) {
+        const parts = filename.split('-')
+        if (parts.length === 2) {
+          const [langCode, countryCode] = parts
+          if (iso639_1Codes.has(langCode) && countryCodePattern.test(countryCode.toUpperCase())) {
+            isValid = true
+          }
+        }
+        // Handle special cases like "es-ca" (Catalan in Spain), "gb-eng" (England), etc.
+        else if (parts.length === 2) {
+          const [part1, part2] = parts
+          // Special cases for regional variants
+          const specialRegionalCases = new Set([
+            'es-ca', 'es-eu', 'es-gl', // Spanish regional variants
+            'gb-eng', 'gb-nir', 'gb-sct', 'gb-wls' // UK regional variants
+          ])
+          if (specialRegionalCases.has(filename)) {
+            isValid = true
+          }
+        }
+      }
+      // Check for 2-letter country codes that are commonly used as language identifiers
+      else if (filename.length === 2 && countryCodePattern.test(filename.toUpperCase())) {
+        // Many country codes are used as language identifiers (e.g., "us" for English US)
+        isValid = true
+      }
+
+      if (!isValid) {
+        invalidFiles.push(file)
+      }
+    }
+
+    // Report any invalid files
+    if (invalidFiles.length > 0) {
+      expect.fail(`Found ${invalidFiles.length} flag files with invalid naming: ${invalidFiles.join(', ')}`)
+    }
+
+    // Ensure we actually tested some files
+    expect(flagFiles.length).to.be.greaterThan(0, 'No flag files found to test')
+  })
+})
\ No newline at end of file