Make it slightly clearer that the app is in beta (#4333)

* Make it slightly clearer that the app is in beta and add linux disclaimer. Also changed the way Modrinth App was being referred to as a regular noun instead of a proper noun

* i18n for app page

* update home page to use ~content

packages/ui/src/utils/common-messages.ts

@@ -5,6 +5,10 @@ export const commonMessages = defineMessages({
 		id: 'button.analytics',
 		defaultMessage: 'Analytics',
 	},
+	betaRelease: {
+		id: 'badge.beta-release',
+		defaultMessage: 'Beta Release',
+	},
 	allProjectType: {
 		id: 'project-type.all',
 		defaultMessage: 'All',