fix(auth): align password validation copy (#5759)

* fix(i18n): add missing frontend translations

- add missing locale entries for API key loading, channel model empty states, auth, playground, and model configuration copy.
- correct inaccurate Russian and Vietnamese model empty-state translations to avoid fallback or misleading copy.

* fix(auth): align password validation copy

- remove the login password length gate so existing shorter passwords are not blocked before reaching the server.
- reuse distinct minimum-length and 8-20 character messages based on the actual validation rule.
- drop unused duplicate password locale keys and align the user creation placeholder with the 8-20 character constraint.

* fix(i18n): add auth validation message translations

- cover schema-driven auth form errors that are translated through FormMessage.
- keep password, username, confirmation, and OTP validation messages available in every locale.

web/default/src/features/auth/constants.ts

@@ -24,10 +24,7 @@ import { z } from 'zod'
 
 export const loginFormSchema = z.object({
   username: z.string().min(1, 'Please enter your username or email'),
-  password: z
-    .string()
-    .min(1, 'Please enter your password')
-    .min(8, 'Password must be at least 8 characters long'),
+  password: z.string().min(1, 'Please enter your password'),
 })
 
 export const registerFormSchema = z
@@ -37,7 +34,7 @@ export const registerFormSchema = z
     password: z
       .string()
       .min(1, 'Please enter your password')
-      .min(8, 'Password must be at least 8 characters long')
+      .min(8, 'Password must be between 8 and 20 characters')
       .max(20, 'Password must be at most 20 characters long'),
     confirmPassword: z.string().min(1, 'Please confirm your password'),
   })

web/default/src/features/setup/setup-wizard.tsx

@@ -221,9 +221,9 @@ export function SetupWizard() {
     if (!password || password.length < 8) {
       form.setError('password', {
         type: 'manual',
-        message: t('Password must be at least 8 characters long'),
+        message: t('Password must be at least 8 characters'),
       })
-      toast.error(t('Password must be at least 8 characters long'))
+      toast.error(t('Password must be at least 8 characters'))
       return false
     }
 

web/default/src/features/users/components/users-mutate-drawer.tsx

@@ -336,7 +336,7 @@ export function UsersMutateDrawer({
                           placeholder={
                             isUpdate
                               ? t('Leave empty to keep unchanged')
-                              : t('Enter password (min 8 characters)')
+                              : t('Enter password (8-20 characters)')
                           }
                         />
                       </FormControl>