chore(1i8n): Fixed grammar and improved wording

Reported at Transifex

Signed-off-by: rakekniven <2069590+rakekniven@users.noreply.github.com>

[skip ci]

apps/files_external/src/views/CredentialsDialog.vue

@@ -15,7 +15,7 @@
 		@update:open="$emit('close')">
 		<!-- Header -->
 		<NcNoteCard class="external-storage-auth__header"
-			:text="t('files_external', 'To access the storage, you need to provide the authentification informations.')"
+			:text="t('files_external', 'To access the storage, you need to provide the authentication credentials.')"
 			type="info" />
 
 		<!-- Login -->