Add subscription management page and currency widget

svelte/src/util/Euro.svelte

@@ -0,0 +1,20 @@
+<script>
+export let amount = 0
+export let precision = 2
+</script>
+
+<span>
+	€
+	<span class:red={amount < 0} class:green={amount > 0}>
+		{(amount / 1000000).toFixed(precision)}
+	</span>
+</span>
+
+<style>
+.red {
+	color: var(--danger_color);
+}
+.green {
+	color: var(--highlight_color);
+}
+</style>