Sort translation keys alphabetically

The goal of this is to make the order more stable and reduce the risk of regressions when merge conflicts are resolved.

Change-Id: I4c51e3ee61f20e64c8291bc08ffb86c8be1ca281
diff --git a/client/i18next-parser.config.js b/client/i18next-parser.config.js
index bcd014c..6729dc7 100644
--- a/client/i18next-parser.config.js
+++ b/client/i18next-parser.config.js
@@ -20,4 +20,5 @@
   locales: ['fr', 'en'],
   output: 'src/locale/$LOCALE/$NAMESPACE.json',
   input: ['src/**/*.{ts,tsx,js,jsx}'],
+  sort: true,
 };