return gulp.src([source + 'lang/*'])
        .pipe(replace(/"content\.series\.data"\:(.*?)\{0\}(.*?),/g, '"content.series.data":$1{{number}}$2,'))
        .pipe(replace(/"content\.series\.data"\:(.*?)\{1\}(.*?),/g, '"content.series.data":$1{{name}}$2,'))
        .pipe(replace(/"splitByLetter\.letter"\:(.*?)\{0\}(.*?),/g, '"splitByLetter.letter":$1{{category}}$2,'))