Network page validation and i18n issue fix

In network page invalid if condition changed, added validations and i18n
function changed based on the vue 3 support.

Change-Id: If5b9c00f6da722984f1c568cfbcb6b34537c3df1
Signed-off-by: Surya Venkatesan <suryav@ami.com>
diff --git a/src/views/Settings/Network/ModalDns.vue b/src/views/Settings/Network/ModalDns.vue
index 0e1bd88..179d831 100644
--- a/src/views/Settings/Network/ModalDns.vue
+++ b/src/views/Settings/Network/ModalDns.vue
@@ -20,10 +20,10 @@
               @input="v$.form.staticDns.$touch()"
             />
             <b-form-invalid-feedback role="alert">
-              <template v-if="!v$.form.staticDns.required">
+              <template v-if="v$.form.staticDns.required.$invalid">
                 {{ $t('global.form.fieldRequired') }}
               </template>
-              <template v-if="!v$.form.staticDns.ipAddress">
+              <template v-if="v$.form.staticDns.ipAddress.$invalid">
                 {{ $t('global.form.invalidFormat') }}
               </template>
             </b-form-invalid-feedback>