do not change "description" key to "Alt text"

- switch Drive file info view to use the `caption` rather than
  `description` i18n key, so that it reads "Alt text"

packages/frontend/src/pages/drive.file.info.vue

@@ -46,7 +46,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</button>
 			<button class="_button" :class="$style.kvEditBtn" @click="describe()">
 				<MkKeyValue :class="$style.multiline">
-					<template #key>{{ i18n.ts.description }}</template>
+					<template #key>{{ i18n.ts.caption }}</template>
 					<template #value>{{ file.comment ? file.comment : `(${i18n.ts.none})` }}<i class="ti ti-pencil" :class="$style.kvEditIcon"></i></template>
 				</MkKeyValue>
 			</button>

sharkey-locales/en-US.yml

@@ -51,7 +51,6 @@ mediaSilencedByBase: "This host's media is silenced implicitly because a base do
 driveSearchbarPlaceholder: "Search drive"
 fileNotSelected: "No file selected"
 background: "Background"
-description: "Alt text"
 inputNewDescription: "Enter new alt text"
 describeFile: "Add alt text"
 enterFileDescription: "Enter alt text"