Fix SPARQL escape URI and string helpers

Apply regex with global flag to escape all occurrenses instead of only
the first one.

Author: erikap

helpers/mu/sparql.js

@@ -73,11 +73,11 @@ function query( queryString ) {
 const update = query;
 
 function sparqlEscapeString( value ){
-  return '"' + value.replace(/[\\"']/, function(match) { return '\\' + match; }) + '"';
+  return '"' + value.replace(/[\\"']/g, function(match) { return '\\' + match; }) + '"';
 };
 
 function sparqlEscapeUri( value ){
-  return '<' + value.replace(/[\\"']/, function(match) { return '\\' + match; }) + '>';
+  return '<' + value.replace(/[\\"']/g, function(match) { return '\\' + match; }) + '>';
 };
 
 function sparqlEscapeInt( value ){