Convert locale files from ini to json format (#35489)

Migrate from the current INI format to JSON for translations. JSON is
widely supported, including by platforms such as Crowdin and Weblate.

build/update-locales.sh

@@ -1,47 +1,17 @@
 #!/bin/sh
 
 # this script runs in alpine image which only has `sh` shell
-
-set +e
-if sed --version 2>/dev/null | grep -q GNU; then
-  SED_INPLACE="sed -i"
-else
-  SED_INPLACE="sed -i ''"
-fi
-set -e
-
-if [ ! -f ./options/locale/locale_en-US.ini ]; then
+if [ ! -f ./options/locale/locale_en-US.json ]; then
   echo "please run this script in the root directory of the project"
   exit 1
 fi
 
-mv ./options/locale/locale_en-US.ini ./options/
-
-# the "ini" library for locale has many quirks, its behavior is different from Crowdin.
-# see i18n_test.go for more details
-
-# this script helps to unquote the Crowdin outputs for the quirky ini library
-# * find all `key="...\"..."` lines
-# * remove the leading quote
-# * remove the trailing quote
-# * unescape the quotes
-# * eg: key="...\"..." => key=..."...
-$SED_INPLACE -r -e '/^[-.A-Za-z0-9_]+[ ]*=[ ]*".*"$/ {
-	s/^([-.A-Za-z0-9_]+)[ ]*=[ ]*"/\1=/
-	s/"$//
-	s/\\"/"/g
-	}' ./options/locale/*.ini
-
-# * if the escaped line is incomplete like `key="...` or `key=..."`, quote it with backticks
-# * eg: key="... => key=`"...`
-# * eg: key=..." => key=`..."`
-$SED_INPLACE -r -e 's/^([-.A-Za-z0-9_]+)[ ]*=[ ]*(".*[^"])$/\1=`\2`/' ./options/locale/*.ini
-$SED_INPLACE -r -e 's/^([-.A-Za-z0-9_]+)[ ]*=[ ]*([^"].*")$/\1=`\2`/' ./options/locale/*.ini
+mv ./options/locale/locale_en-US.json ./options/
 
 # Remove translation under 25% of en_us
-baselines=$(wc -l "./options/locale_en-US.ini" | cut -d" " -f1)
+baselines=$(wc -l "./options/locale_en-US.json" | cut -d" " -f1)
 baselines=$((baselines / 4))
-for filename in ./options/locale/*.ini; do
+for filename in ./options/locale/*.json; do
   lines=$(wc -l "$filename" | cut -d" " -f1)
   if [ $lines -lt $baselines ]; then
     echo "Removing $filename: $lines/$baselines"
@@ -49,4 +19,4 @@ for filename in ./options/locale/*.ini; do
   fi
 done
 
-mv ./options/locale_en-US.ini ./options/locale/
+mv ./options/locale_en-US.json ./options/locale/