use sign in / up instead of login / register

frontend/pages/register.vue

@@ -46,8 +46,8 @@ async function submit() {
 <template>
     <Card class="w-full max-w-sm">
         <CardHeader>
-            <CardTitle class="text-2xl">Register</CardTitle>
-            <CardDescription> Create a new user account </CardDescription>
+            <CardTitle class="text-2xl">Sign up</CardTitle>
+            <CardDescription>Create a new user account</CardDescription>
         </CardHeader>
         <CardContent class="grid gap-4">
             <div class="grid gap-2">
@@ -88,10 +88,10 @@ async function submit() {
                 class="w-full"
                 :disabled="!allFieldsValid || registering"
                 @click="submit"
-                >Register</Button
+                >Sign up</Button
             >
             <NuxtLink to="/login" class="w-full">
-                <Button class="w-full" variant="ghost">Log in instead</Button>
+                <Button class="w-full" variant="ghost">Sign in instead</Button>
             </NuxtLink>
         </CardFooter>
     </Card>