Add script to merge and normalize i18n files

scripts/refresh-i18n.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# "Refresh" all i18n language files by merging missing keys in lang files
+# from a base language file. In addition, sort all files by keys.
+
+BASE_DIR=$(dirname "$0")"/../i18n" # Exclude the trailing slash.
+BASE_FILE="en.json"
+
+# Iterate through all i18n files and merge them into the base file,
+# filling in missing keys.
+for fpath in "$BASE_DIR/"*.json; do
+	echo $(basename -- $fpath)
+	echo "$( jq -s '.[0] * .[1]' -S --indent 4 "$BASE_DIR/$BASE_FILE" $fpath )" > $fpath
+done