Enable multiple Localizable.strings on xCode 11.x.x with new build system

MergeLocalizable.sh

#!/bin/sh

#  MergeLocalizable.sh
#  EAD
#
#  Created by Antonio Scardigno on 24/04/2020.
#  Copyright © 2020 UPU. All rights reserved.

############################################################
##ONLY FOR TEST############################################# if u would run it from terminal uncomment these line
#SRCROOT = "put path folder that contain project file.  " ## ex: /Users/username/xCodeProject/myApp
#PROJECT_NAME = "put name of project"                     ## ex: MyApp
############################################################

### ENVIRONMENT VARIABLE DURING BUILD
### SRCROOT root of the project
### PROJECT_NAME name of the project

### move into resources folder of the porject
cd "${SRCROOT}/${PROJECT_NAME}/Resource"

### foreach folder ending with .lproj
for file in *; do
    if [[ -d "$file"  ]] && [[ "$file" == *".lproj" ]]; then
    
        ### move in
        cd "$file"
        
        ### clear Localizable .strings
        echo "" > Localizable.strings
        
        ### for each .localizable.strings files
        for file in *.localizable.strings; do
            ### read it
            while read line; do
                ### and append in Localizable.strings
                echo "$line" >> Localizable.strings
            done < $file
        done
    
        ### go to previous folder and then start it agin with next .lproj folder
        cd ".."
    fi
done

To use it:

1. Import it in your project
2. Add this script in Build Phases (click on your poject, move in Build Phases tab, click on + button, drag and drop script on new buil phases added and move it to the top of other build phases)
3. Put you localization folder and file in PATH_TO_MY_PROJECT/MyApp/Resource
4. Add and EMPTY localizable strings
5. Create as many file as you want with .localizable.strings extension

So the structure should be this:

PROJECT_WORKSPACE
|-FolderOfMyProject
   |-- MyProject.xcodeProj
   |-- MyProject.xcworkspace
   |-- ProjectName
         |-- Resource
               |-- en.lproj (as many as language of your app)
                    |-- Localizable.strings //not add here your string, it is overwritten every time
                    |-- LocalizableFIle1.localizable.strings
                    |-- LocalizableFIle2.localizable.strings
                    |-- LocalizableFIle3.localizable.strings
                    |-- .....