色々な修正; Fix #4709 (#4714)

* Fix a la carte 1

* use dialog instead of alert() etc

src/client/app/mobile/views/components/drive.file-detail.vue

@@ -136,7 +136,10 @@ export default Vue.extend({
 		},
 
 		showCreatedAt() {
-			alert(new Date(this.file.createdAt).toLocaleString());
+			this.$root.dialog({
+				type: 'info',
+				text: (new Date(this.file.createdAt)).toLocaleString()
+			});
 		}
 	}
 });
@@ -150,11 +153,13 @@ export default Vue.extend({
 
 		> .preview
 			width fit-content
+			width -moz-fit-content
 			max-width 100%
 			margin 0 auto
 			box-shadow 1px 1px 4px rgba(#000, 0.2)
 			overflow hidden
 			color var(--driveFileIcon)
+			justify-content center
 
 		> footer
 			padding 8px 8px 0 8px

src/client/app/mobile/views/components/post-form.vue

@@ -283,14 +283,21 @@ export default Vue.extend({
 
 		setGeo() {
 			if (navigator.geolocation == null) {
-				alert(this.$t('location-alert'));
+				this.$root.dialog({
+					type: 'warning',
+					text: this.$t('geolocation-alert')
+				});
 				return;
 			}
 
 			navigator.geolocation.getCurrentPosition(pos => {
 				this.geo = pos.coords;
 			}, err => {
-				alert(`%i18n:@error%: ${err.message}`);
+				this.$root.dialog({
+					type: 'error',
+					title: this.$t('error')
+					text: err.message
+				});
 			}, {
 					enableHighAccuracy: true
 				});