BUG: Missed localization keys for de locale

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

Not browser related

Reproducible demo link

https://codesandbox.io/s/pensive-river-417grm?file=/index.js

Describe the bug

How to reproduce the bug?

1. import grapesjs/src/i18n/locale/de.js
2. use this as a locale in your editor config

What is the expected behavior? Everything in German

What is the current behavior? locale files besides English lack of key, f.e.: 'background-repeat-sub', 'border-width-sub', 'padding-top-sub', and so on. Because of this you have partially English editor even if you're using German locale

If is necessary to execute some code in order to reproduce the bug, paste it here below:

import grapesjs from "grapesjs";
import deLocale from "grapesjs/src/i18n/locale/de.js";
import "grapesjs-blocks-basic";

const editor = grapesjs.init({
  container: "#gjs",
  fromElement: 1,
  storageManager: { type: 0 },
  i18n: {
    locale: "de",
    detectLocale: false,
    messagesAdd: {
      de: deLocale
    }
  },
  plugins: ["gjs-blocks-basic"]
});

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