refactored more error code

frontend/src/routes/user/ResetPw.svelte

@@ -3,10 +3,10 @@
     import { useTinyRouter } from 'svelte-tiny-router';
 
     import { api }           from '../../urls.svelte.js';
+    import { error }  from '../../warn.svelte';
     import { t }             from '../../translations.svelte.js';
 
     let caption  = t('send_mail');
-    let error    = null;
     let mail     = "";
     const router = useTinyRouter();
 
@@ -35,7 +35,7 @@
             if (resp.ok){
                 router.navigate('/user')
             } else {
-                error = await resp.text();
+                error(resp);
             }
         }
     }
@@ -66,8 +66,5 @@
         {t('enter_email')}
     </label>
     <button type="submit">{caption}</button>
-    {#if error}
-    <div class="error">{error}</div>
-    {/if}
 </fieldset>
 </form>