add missing whitespace in pdf.pug

services/web/app/views/project/editor/pdf.pug

@@ -345,7 +345,7 @@ div.full-size.pdf(ng-controller="PdfController")
 				span #{translate("project_flagged_too_many_compiles")}
 
 			.alert.alert-danger(ng-show="pdf.compileInProgress")
-				strong #{translate("pdf_compile_in_progress_error")}
+				strong #{translate("pdf_compile_in_progress_error")}. 
 				span #{translate("pdf_compile_try_again")}
 
 			.alert.alert-danger(ng-show="pdf.timedout")