refactor: enhance localizations

lib/l10n/app_en.arb

@@ -236,5 +236,44 @@
   "webSearch": "Web Search",
   "webSearchDescription": "Search the web and cite sources in replies.",
   "imageGeneration": "Image Generation",
-  "imageGenerationDescription": "Create images from your prompts."
+  "imageGenerationDescription": "Create images from your prompts.",
+  "copy": "Copy",
+  "edit": "Edit",
+  "regenerate": "Regenerate",
+  "noConversationsYet": "No conversations yet"
+  ,
+  "usernameOrEmailHint": "Enter your username or email",
+  "passwordHint": "Enter your password",
+  "enterApiKey": "Enter your API key",
+  "signingIn": "Signing in...",
+  "advancedSettings": "Advanced Settings",
+  "customHeaders": "Custom Headers",
+  "customHeadersDescription": "Add custom HTTP headers for authentication, API keys, or special server requirements.",
+  "headerNameEmpty": "Header name cannot be empty",
+  "headerNameTooLong": "Header name too long (max 64 characters)",
+  "headerNameInvalidChars": "Invalid header name. Use only letters, numbers, and these symbols: !#$&-^_`|~",
+  "headerNameReserved": "Cannot override reserved header \"{key}\"",
+  "@headerNameReserved": {"placeholders": {"key": {"type": "String"}}},
+  "headerValueEmpty": "Header value cannot be empty",
+  "headerValueTooLong": "Header value too long (max 1024 characters)",
+  "headerValueInvalidChars": "Header value contains invalid characters. Use only printable ASCII.",
+  "headerValueUnsafe": "Header value appears to contain potentially unsafe content",
+  "headerAlreadyExists": "Header \"{key}\" already exists. Remove it first to update.",
+  "@headerAlreadyExists": {"placeholders": {"key": {"type": "String"}}},
+  "maxHeadersReachedDetail": "Maximum of 10 custom headers allowed. Remove some to add more."
+  ,
+  "editMessage": "Edit Message"
+  ,
+  "noModelsAvailable": "No models available",
+  "followingSystem": "Following system: {theme}",
+  "@followingSystem": {"placeholders": {"theme": {"type": "String"}}},
+  "themeDark": "Dark",
+  "themeLight": "Light",
+  "currentlyUsingDarkTheme": "Currently using Dark theme",
+  "currentlyUsingLightTheme": "Currently using Light theme",
+  "aboutConduit": "About Conduit",
+  "versionLabel": "Version: {version} ({build})",
+  "@versionLabel": {"placeholders": {"version": {"type": "String"}, "build": {"type": "String"}}},
+  "githubRepository": "GitHub Repository",
+  "unableToLoadAppInfo": "Unable to load app info"
 }