Minify translations downloaded from Lokalise (#611)

gulp/tasks/translations-extract.js

@@ -0,0 +1,15 @@
+const gulp = require('gulp');
+const minify = require('gulp-jsonminify');
+const rename = require('gulp-rename');
+const streamify = require('gulp-streamify');
+const zip = require('gulp-vinyl-zip');
+
+function translationsExtract() {
+  return zip.src('build-temp/Home_Assistant_-_Polymer_frontend-locale.zip')
+    .pipe(rename({
+      dirname: '',
+    }))
+    .pipe(streamify(minify()))
+    .pipe(gulp.dest('translations'));
+}
+gulp.task('translations-extract', translationsExtract.bind(null));