chore(style): buttons are left-aligned by default

front/src/components/ui/Button.vue

@@ -63,7 +63,7 @@ onMounted(() => {
     class="funkwhale button"
     :class="[
       'is-text-aligned-' + (alignText ?? 'center'),
-      'is-self-aligned-' + (alignSelf ?? 'center'),
+      'is-self-aligned-' + (alignSelf ?? 'start'),
       {
         'is-active': isActive,
         'is-loading': isLoading,