Enhance localization by completing missing translations across all locales + czech support (#6758)

* Add Missing translations for id

* Add Missing translations for pl

* Add Missing translations for vn

* Add Missing translations for zh-CN

* Add Missing translations for zh-TW

* Add Missing translations for de-DE

* Add Missing translations for cs

* Extend Czech language support in Jan

Author: github-roushan

web-app/src/containers/LanguageSwitcher.tsx

@@ -16,6 +16,7 @@ const LANGUAGES = [
   { value: 'zh-CN', label: '简体中文' },
   { value: 'zh-TW', label: '繁體中文' },
   { value: 'de-DE', label: 'Deutsch' },
+  { value: 'cs', label: 'Čeština' },
   { value: 'pt-BR', label: 'Português (Brasil)' },
   { value: 'ja', label: '日本語' },
   { value: 'ru', label: 'Русский' },

web-app/src/locales/cs/assistants.json

@@ -0,0 +1,35 @@
+{
+  "title": "Assistants",
+  "editAssistant": "Edit Assistant",
+  "deleteAssistant": "Delete Assistant",
+  "deleteConfirmation": "Delete Assistant",
+  "deleteConfirmationDesc": "Are you sure you want to delete this assistant? This action cannot be undone.",
+  "cancel": "Cancel",
+  "delete": "Delete",
+  "addAssistant": "Add Assistant",
+  "emoji": "Emoji",
+  "name": "Name",
+  "enterName": "Enter name",
+  "nameRequired": "Name is required",
+  "description": "Description (optional)",
+  "enterDescription": "Enter description",
+  "instructions": "Instructions",
+  "enterInstructions": "Enter instructions",
+  "predefinedParameters": "Predefined Parameters",
+  "parameters": "Parameters",
+  "key": "Key",
+  "value": "Value",
+  "stringValue": "String",
+  "numberValue": "Number",
+  "booleanValue": "Boolean",
+  "jsonValue": "JSON",
+  "trueValue": "True",
+  "falseValue": "False",
+  "jsonValuePlaceholder": "JSON Value",
+  "save": "Save",
+  "createNew": "Create New Assistant",
+  "personality": "Personality",
+  "capabilities": "Capabilities",
+  "instructionsDateHint": "Tip: Use {{current_date}} to insert today’s date.",
+  "maxToolSteps": "Max tool steps"
+}

web-app/src/locales/cs/chat.json

@@ -0,0 +1,12 @@
+{
+  "welcome": "Hi, how are you?",
+  "description": "How can I help you today?",
+  "temporaryChat": "Temporary Chat",
+  "temporaryChatDescription": "Start a temporary conversation that won't be saved to your chat history.",
+  "status": {
+    "empty": "No Chats Found"
+  },
+  "sendMessage": "Send Message",
+  "newConversation": "New Conversation",
+  "clearHistory": "Clear History"
+}