diff --git a/i18n/README.md b/i18n/README.md
index 84d813b0..2056e3b8 100644
--- a/i18n/README.md
+++ b/i18n/README.md
@@ -2,6 +2,8 @@
 
 The easiets way to help translate the game is with weblate. Simply use [hosted.weblate.org/projects/pixelplanet](https://hosted.weblate.org/projects/pixelplanet/). Feel free to ask in the Translation section in [our Discord](https://pixelplanet.fun/guilded) if you need help.
 
+If a language code differs from the country code of a wanted flag, it can be defined in the `i18n/lccc.json` file. In example `{ "en": "gb" }` maps the english language to the flag of Great Britain.
+
 [![Translation status](https://hosted.weblate.org/widget/pixelplanet/open-graph.png)](https://hosted.weblate.org/engage/pixelplanet/)
 
 # Translating Offline
@@ -12,8 +14,6 @@ Translation files can be created out of the templates [template.pot](https://git
 
 All translated languages get an own chat channel that just people who use this language can access.
 
-If a language code differs from the country code of a wanted flag, it can be defined in the ssr filename, like `ssr-en-gb.po` would be the english language, with the flag of Great Britain.
-
 ## With poedit
 
 ### Create new translation
diff --git a/scripts/build.js b/scripts/build.js
index 294cf7b8..35c04fe1 100644
--- a/scripts/build.js
+++ b/scripts/build.js
@@ -5,13 +5,13 @@
 
 const path = require('path');
 const fs = require('fs');
+const readline = require('readline');
 const { spawn } = require('child_process');
 const webpack = require('webpack');
 
 const minifyCss = require('./minifyCss');
 const serverConfig = require('../webpack.config.server.js');
 const clientConfig = require('../webpack.config.client.js');
-const { getAllAvailableLocals } = clientConfig;
 
 let langs = 'all';
 let doBuildServer = false;
@@ -46,6 +46,88 @@ if (!doBuildServer && !doBuildClient) {
   doBuildClient = true;
 }
 
+/*
+ * get available locals based on the files available in ../i18n
+ */
+function getAllAvailableLocals() {
+  const langDir = path.resolve(__dirname, '..', 'i18n');
+  const langs = fs.readdirSync(langDir)
+    .filter((e) => (e.endsWith('.po') && !e.startsWith('ssr')))
+    .map((l) => l.slice(0, -3));
+  langs.unshift('en');
+  return langs;
+}
+
+/*
+ * get amount of msgid and msgstr of po file
+ */
+function getPoFileStats(file) {
+  return new Promise((resolve) => {
+    const fileStream = fs.createReadStream(file);
+    const lineReader = readline.createInterface({ 
+      input: fileStream,
+      crlfDelay: Infinity,
+    });
+
+    let msgid = 0;
+    let msgstr = 0;
+
+    lineReader.on('line', (l) => {
+      l = l.trim();
+      if (l.endsWith('""')) {
+        return;
+      }
+      let seperator = l.indexOf(' ');
+      if (seperator === -1) {
+        seperator = l.indexOf('\t');
+      }
+      if (seperator === -1) {
+        return;
+      }
+      const tag = l.substring(0, seperator);
+      if (tag === 'msgid') {
+        msgid += 1;
+      } else if (tag === 'msgstr') {
+        msgstr += 1;
+      }
+    });
+
+    lineReader.on('close', (l) => {
+      resolve({ msgid, msgstr });
+    });
+  });
+}
+
+async function filterLackingLocals(langs, percentage) {
+  langs = langs.filter((l) => l !== 'en');
+  const promises = [];
+  const { msgid, msgstr } = await getPoFileStats(path.resolve(
+    __dirname, '..', 'i18n', `template.pot`,
+  ));
+
+  const langStats = await Promise.all(langs
+    .map((l) => getPoFileStats(
+      path.resolve(__dirname, '..', 'i18n', `${l}.po`),
+    )));
+  const goodLangs = [ 'en' ];
+  const badLangs = [];
+  for (let i = 0; i < langs.length; i += 1) {
+    const lang = langs[i];
+    const stats = langStats[i];
+    const percent = Math.floor(stats.msgstr / msgid * 100);
+    if (percent >= percentage) {
+      goodLangs.push(lang);
+    } else {
+      console.log(`Lang ${lang} completion:`, percent, '%');
+      badLangs.push(lang);
+    }
+  }
+  return {
+    goodLangs,
+    badLangs,
+  };
+}
+
 function compile(webpackConfig) {
   return new Promise((resolve, reject) => {
     webpack(webpackConfig, (err, stats) => {
@@ -156,13 +238,23 @@ async function buildProduction() {
   if (langs !== 'all') {
     avlangs = langs.split(',').map((l) => l.trim())
       .filter((l) => avlangs.includes(l));
-    if (!avlangs.length) {
-      console.error(`ERROR: language ${langs} not available`);
-      process.exit(1);
-      return;
+  } else {
+    const { avlangs: goodLangs, badLangs } = await filterLackingLocals(avlangs, 50);
+    if (badLangs.length) {
+      console.log(
+        'Skipping',
+        badLangs.length,
+        'locals because of low completition:',
+        badLangs,
+      );
     }
   }
-  console.log('Building locales:', avlangs);
+  if (!avlangs.length) {
+    console.error(`ERROR: language ${langs} not available`);
+    process.exit(1);
+    return;
+  }
+  console.log('Building', avlangs.length, 'locales:', avlangs);
 
   const promises = [];
 
diff --git a/src/core/ttag.js b/src/core/ttag.js
index b9354712..60d4c520 100644
--- a/src/core/ttag.js
+++ b/src/core/ttag.js
@@ -6,6 +6,7 @@ import cookie from 'cookie';
 
 import assetWatcher from './fsWatcher';
 import { getLangsOfJsAsset } from './assets';
+import lccc from '../../i18n/lccc.json';
 
 // eslint-disable-next-line max-len
 const localeImports = require.context('../../i18n', false, /^\.[/\\]ssr-.+\.po$/);
@@ -32,16 +33,11 @@ function loadTtags() {
     const file = langs[i];
     // ./ssr-de.po
     let lang = file.replace('./ssr-', '').replace('.po', '').toLowerCase();
-    let flag = lang;
     /*
-     * in cases where the language code and country code differ,
-     * the country code can be given seperately in the file name
-     * i.e.: ./ssr-en-gb.po
+     * In cases where the language code and country code differ,
+     * it can be mapped in i18n/lccc.json
      */
-    const seperator = lang.indexOf('-');
-    if (seperator !== -1) {
-      [lang, flag] = lang.split('-');
-    }
+    let flag = lccc[lang] || lang;
     if (jsLangs.includes(lang)) {
       if (!ttags[lang]) {
         const ttag = new TTag();
diff --git a/webpack.config.client.js b/webpack.config.client.js
index 08d85adf..e2d65259 100644
--- a/webpack.config.client.js
+++ b/webpack.config.client.js
@@ -183,13 +183,3 @@ module.exports = ({
   };
 }
 
-function getAllAvailableLocals() {
-  const langDir = path.resolve('i18n');
-  const langs = fs.readdirSync(langDir)
-    .filter((e) => (e.endsWith('.po') && !e.startsWith('ssr')))
-    .map((l) => l.slice(0, -3));
-  langs.unshift('en');
-  return langs;
-}
-
-module.exports.getAllAvailableLocals = getAllAvailableLocals;