[upload] upload options should be described

conf/locale/locale_en-US.ini

@@ -1326,7 +1326,8 @@ raw_seconds = seconds
 raw_minutes = minutes
 
 [dropzone]
-default_message = Drop files here or click to upload.
+default_message = Drop files here or click to upload.zz
 invalid_input_type = You can't upload files of this type.
 file_too_big = File size ({{filesize}} MB) exceeds maximum size ({{maxFilesize}} MB).
 remove_file = Remove file
+upload_message = Drop files here or click to upload.<p> You can upload a maximum of %d files at the same time, each one no larger than %d MB. <p>To upload a complete folder structure you can drag and drop the folder here (if your browser supports it).

templates/repo/editor/upload.tmpl

@@ -27,7 +27,7 @@
 			</div>
 			<div class="field">
 				<div class="files"></div>
-				<div class="ui basic button dropzone" id="dropzone" data-upload-url="{{.RepoLink}}/upload-file" data-remove-url="{{.RepoLink}}/upload-remove" data-csrf="{{.CSRFToken}}" data-accepts="{{.UploadAllowedTypes}}" data-max-file="{{.UploadMaxFiles}}" data-max-size="{{.UploadMaxSize}}" data-default-message="{{.i18n.Tr "dropzone.default_message"}} (bulk upload is limited to {{.UploadMaxFiles}} files) " data-invalid-input-type="{{.i18n.Tr "dropzone.invalid_input_type"}}" data-file-too-big="{{.i18n.Tr "dropzone.file_too_big"}}" data-remove-file="{{.i18n.Tr "dropzone.remove_file"}}"></div>
+				<div class="ui basic button dropzone" id="dropzone" data-upload-url="{{.RepoLink}}/upload-file" data-remove-url="{{.RepoLink}}/upload-remove" data-csrf="{{.CSRFToken}}" data-accepts="{{.UploadAllowedTypes}}" data-max-file="{{.UploadMaxFiles}}" data-max-size="{{.UploadMaxSize}}" data-default-message="{{.i18n.Tr "dropzone.upload_message" .UploadMaxFiles .UploadMaxSize}}" data-invalid-input-type="{{.i18n.Tr "dropzone.invalid_input_type"}}" data-file-too-big="{{.i18n.Tr "dropzone.file_too_big"}}" data-remove-file="{{.i18n.Tr "dropzone.remove_file"}}"></div>
 			</div>
 			{{template "repo/editor/commit_form" .}}
 		</form>