Implemented loading of custom flags for languages, not associated with concrete country.

Implemented "unknown" language flag to prevent errors for new languages when flag can't be associated automatically

packages/app/components/i18n/flags/eo.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="640" height="480">
+    <path fill="#FFF" d="M0 0h242v242H0"/>
+    <path d="M0 240h240V0h400v480H0m69.6-291.6l49.2-151.2L168 188.4 39.6 94.8h159.6" fill="#090"/>
+</svg>

packages/app/components/i18n/flags/unknown.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="640" height="480">
+    <path fill="#BCBCBC" d="M0 390h640v90H0z"/>
+    <path fill="#F2F2F2" d="M0 90h640v300H0z"/>
+    <path fill="#BCBCBC" d="M0 0h640v90H0z"/>
+    <path d="M338 281.75v28.5a4.762 4.762 0 01-4.75 4.75h-28.5a4.762 4.762 0 01-4.75-4.75v-28.5a4.762 4.762 0 014.75-4.75h28.5a4.762 4.762 0 014.75 4.75zm36.985-69.875c0 22.268-15.217 30.817-26.42 37.028-6.959 3.982-11.322 12.067-11.322 15.472 0 2.58-2.007 5.625-4.717 5.625H304.22c-2.597 0-4.242-3.983-4.242-6.563v-5.272c0-14.183 14.153-26.37 24.532-31.058 9.08-4.102 12.854-7.964 12.854-15.472 0-6.563-8.612-12.42-18.16-12.42-5.307 0-10.146 1.642-12.735 3.398-2.83 1.994-5.661 4.807-12.62 13.477-.944 1.17-2.363 1.875-3.654 1.875-1.064 0-2.008-.352-2.951-.938l-19.34-14.647c-2.007-1.523-2.475-4.102-1.177-6.21C279.461 175.193 297.39 165 321.452 165 346.694 165 375 185.04 375 211.875h-.015z" fill="#000"/>
+</svg>

packages/app/components/i18n/localeFlags.ts

@@ -27,8 +27,25 @@ export default {
      * @returns {string}
      */
     getIconUrl(locale: string): string {
-        // eslint-disable-next-line @typescript-eslint/no-var-requires
-        const mod = require(`flag-icon-css/flags/4x3/${localeToCountryCode[locale] || locale}.svg`);
+        let mod;
+
+        try {
+            mod = require(`./flags/${locale}.svg`);
+        } catch (err1) {
+            if (!err1.message.startsWith('Cannot find module')) {
+                throw err1;
+            }
+
+            try {
+                mod = require(`flag-icon-css/flags/4x3/${localeToCountryCode[locale] || locale}.svg`);
+            } catch (err2) {
+                if (!err2.message.startsWith('Cannot find module')) {
+                    throw err2;
+                }
+
+                mod = require('./flags/unknown.svg');
+            }
+        }
 
         return mod.default || mod;
     },

webpack.config.js

@@ -114,6 +114,11 @@ const webpackConfig = {
             /flag-icon-css\/flags\/4x3/,
             new RegExp(`/(${localeFlags.getCountryList().join('|')})\\.svg`),
         ),
+        // @see components/i18n/localeFlags.js
+        new webpack.ContextReplacementPlugin(
+            /app\/components\/i18n\/flags/,
+            new RegExp(`/(${localeFlags.getCountryList().join('|')})\\.svg`),
+        ),
     ],
 
     module: {