I18n is not defined, bug

Web Developers React Js and Meteor
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1

Our React app is loading very slow. There are two error messages in console, here’s a copy/paste of one:

overrides?v=6d9be5a7a7c1c9c05aa5b8bb1d7a43a1:1 Uncaught ReferenceError: I18n is not defined
    at overrides?v=6d9be5a7a7c1c9c05aa5b8bb1d7a43a1:1:1
module-shims.js:5 Uncaught ReferenceError: I18n is not defined
    at a.callback (module-shims.js:5:1)
    at a.exports (loader.js:106:1)
    at a._reify (loader.js:143:1)
    at a.reify (loader.js:130:1)
    at a.exports (loader.js:104:1)
    at a._reify (loader.js:143:1)
    at a.reify (loader.js:130:1)
    at a.exports (loader.js:104:1)
    at a._reify (loader.js:143:1)
    at a.reify (loader.js:130:1)

Here’s what it shows in Sources:

I18n._overrides = {}; (here it shows an X symbol to indicate this line is the problem)
I18n._overrides['en'] = {
    "js.filters.categories.title": "Departments",
    "js.user.preferences_nav.categories": "Departments",
    "js.user.categories_settings": "Departments",
    "admin_js.admin.reseed.modal.categories": "Departments",
    "js.categories.category": "Departments",
    "js.category.all": "All Departments",
    "js.category.list": "List Departments",
    "js.categories.all": "all departments",
    "js.categories_list": "Departments List",
    "js.user.summary.top_categories": "Top Departments",
    "js.categories.reorder.title": "Reorder Departments",
    "js.categories.subcategories": "Sub Departments",
    "js.category.list_filters.none": "no sub departments",
    "js.categories.category_list": "Display departments list",
    "js.categories.n_more": "Departments (%{count} more) ...",
    "js.category_page_style.categories_only": "Departments Only",
    "js.filters.categories.title_in": "Department - %{categoryName}",
    "js.topic.browse_all_categories": "Browse all departments",
    "admin_js.admin.wizard.action.watch_categories.categories": "Departments"
};
I18n._mfOverrides = {};

Here is our Git: GitHub - focallocal/fl-maps: The Public Happiness Movement: A platform bringing people and communities together to solve any and all societal issues. BTM branch is a project aiming to solve world involuntary homelessness. PHM brings communities together to create social initiatives for kindness and well-being.

Can you see what needs to be changed?