Upgrade/install: Fix/clarify the "Upload in a zip format" string.

Props greenshady, mariovalney.
See #9757.
Built from https://develop.svn.wordpress.org/trunk@48509


git-svn-id: http://core.svn.wordpress.org/trunk@48271 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/plugin-install.php

@@ -349,7 +349,7 @@ function install_search_form( $deprecated = true ) {
 function install_plugins_upload() {
 	?>
 <div class="upload-plugin">
-	<p class="install-help"><?php _e( 'If you have a plugin in a .zip format, you may install it by uploading it here.' ); ?></p>
+	<p class="install-help"><?php _e( 'If you have a plugin in a .zip format, you may install or update it by uploading it here.' ); ?></p>
 	<form method="post" enctype="multipart/form-data" class="wp-upload-form" action="<?php echo self_admin_url( 'update.php?action=upload-plugin' ); ?>">
 		<?php wp_nonce_field( 'plugin-upload' ); ?>
 		<label class="screen-reader-text" for="pluginzip"><?php _e( 'Plugin zip file' ); ?></label>

wp-admin/includes/theme-install.php

@@ -179,7 +179,7 @@ function install_themes_dashboard() {
  */
 function install_themes_upload() {
 	?>
-<p class="install-help"><?php _e( 'If you have a theme in a .zip format, you may install it by uploading it here.' ); ?></p>
+<p class="install-help"><?php _e( 'If you have a theme in a .zip format, you may install or update it by uploading it here.' ); ?></p>
 <form method="post" enctype="multipart/form-data" class="wp-upload-form" action="<?php echo self_admin_url( 'update.php?action=upload-theme' ); ?>">
 	<?php wp_nonce_field( 'theme-upload' ); ?>
 	<label class="screen-reader-text" for="themezip"><?php _e( 'Theme zip file' ); ?></label>

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-beta2-48508';
+$wp_version = '5.5-beta2-48509';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.