Change file input language

If my browser has Polish language then file input has Polish language
too. However I would expect English language like whole app.
More details: https://github.com/openbmc/webui-vue/issues/20

Signed-off-by: Mateusz Gapski <mateuszx.gapski@intel.com>
Change-Id: I20119fdd29686e1a4e6bed9ddd78a0e559afc694
diff --git a/src/views/AccessControl/SslCertificates/ModalUploadCertificate.vue b/src/views/AccessControl/SslCertificates/ModalUploadCertificate.vue
index 653a232..a97fa4d 100644
--- a/src/views/AccessControl/SslCertificates/ModalUploadCertificate.vue
+++ b/src/views/AccessControl/SslCertificates/ModalUploadCertificate.vue
@@ -47,7 +47,9 @@
           id="certificate-file"
           v-model="form.file"
           accept=".pem"
-          plain
+          :browse-text="$t('global.fileUpload.browseText')"
+          :drop-placeholder="$t('global.fileUpload.dropPlaceholder')"
+          :placeholder="$t('global.fileUpload.placeholder')"
           :state="getValidationState($v.form.file)"
         />
         <b-form-invalid-feedback role="alert">