diff --git a/src/main.js b/src/main.js
index 1dcd38660cd..beeae6f79be 100644
--- a/src/main.js
+++ b/src/main.js
@@ -280,111 +280,112 @@ function getNLSConfiguration(locale) {
 		return undefined;
 	}
 
-	let isCoreLanguage = true;
-	if (locale) {
-		isCoreLanguage = ['de', 'es', 'fr', 'it', 'ja', 'ko', 'ru', 'zh-cn', 'zh-tw'].some((language) => {
-			return locale === language || locale.startsWith(language + '-');
-		});
-	}
-
-	if (isCoreLanguage) {
-		return Promise.resolve(resolveLocale(locale));
-	} else {
-		perf.mark('nlsGeneration:start');
-		let defaultResult = function() {
+	perf.mark('nlsGeneration:start');
+	let defaultResult = function(locale) {
+		let isCoreLanguage = true;
+		if (locale) {
+			isCoreLanguage = ['de', 'es', 'fr', 'it', 'ja', 'ko', 'ru', 'zh-cn', 'zh-tw'].some((language) => {
+				return locale === language || locale.startsWith(language + '-');
+			});
+		}
+		if (isCoreLanguage) {
+			let result = resolveLocale(locale);
+			perf.mark('nlsGeneration:end');
+			return Promise.resolve(result);
+		} else  {
 			perf.mark('nlsGeneration:end');
 			return Promise.resolve({ locale: locale, availableLanguages: {} });
-		};
-		try {
-			let commit = getCommit();
-			if (!commit) {
-				return defaultResult();
+		}
+	};
+	try {
+		let commit = getCommit();
+		if (!commit) {
+			return defaultResult(locale);
+		}
+		let configs = getLanguagePackConfigurations();
+		if (!configs) {
+			return defaultResult(locale);
+		}
+		let initialLocale = locale;
+		locale = resolveLanguagePackLocale(configs, locale);
+		if (!locale) {
+			return defaultResult(initialLocale);
+		}
+		let packConfig = configs[locale];
+		let mainPack;
+		if (!packConfig || typeof packConfig.hash !== 'string' || !packConfig.translations || typeof (mainPack = packConfig.translations['vscode']) !== 'string') {
+			return defaultResult(locale);
+		}
+		return exists(mainPack).then((fileExists) => {
+			if (!fileExists) {
+				return defaultResult(locale);
 			}
-			let configs = getLanguagePackConfigurations();
-			if (!configs) {
-				return defaultResult();
-			}
-			let initialLocale = locale;
-			locale = resolveLanguagePackLocale(configs, locale);
-			if (!locale) {
-				return defaultResult();
-			}
-			let packConfig = configs[locale];
-			let mainPack;
-			if (!packConfig || typeof packConfig.hash !== 'string' || !packConfig.translations || typeof (mainPack = packConfig.translations['vscode']) !== 'string') {
-				return defaultResult();
-			}
-			return exists(mainPack).then((fileExists) => {
-				if (!fileExists) {
-					return defaultResult();
+			let packId = packConfig.hash + '.' + locale;
+			let cacheRoot = path.join(userData, 'clp', packId);
+			let coreLocation = path.join(cacheRoot, commit);
+			let translationsConfigFile = path.join(cacheRoot, 'tcf.json');
+			let result = {
+				locale: initialLocale,
+				availableLanguages: { '*': locale },
+				_languagePackId: packId,
+				_translationsConfigFile: translationsConfigFile,
+				_cacheRoot: cacheRoot,
+				_resolvedLanguagePackCoreLocation: coreLocation
+			};
+			return exists(coreLocation).then((fileExists) => {
+				if (fileExists) {
+					// We don't wait for this. No big harm if we can't touch
+					touch(coreLocation).catch(() => {});
+					perf.mark('nlsGeneration:end');
+					return result;
 				}
-				let packId = packConfig.hash + '.' + locale;
-				let cacheRoot = path.join(userData, 'clp', packId);
-				let coreLocation = path.join(cacheRoot, commit);
-				let translationsConfigFile = path.join(cacheRoot, 'tcf.json');
-				let result = {
-					locale: initialLocale,
-					availableLanguages: { '*': locale },
-					_languagePackId: packId,
-					_translationsConfigFile: translationsConfigFile,
-					_cacheRoot: cacheRoot,
-					_resolvedLanguagePackCoreLocation: coreLocation
-				};
-				return exists(coreLocation).then((fileExists) => {
-					if (fileExists) {
-						// We don't wait for this. No big harm if we can't touch
-						touch(coreLocation).catch(() => {});
-						perf.mark('nlsGeneration:end');
-						return result;
-					}
-					return mkdirp(coreLocation).then(() => {
-						return Promise.all([readFile(path.join(__dirname, 'nls.metadata.json')), readFile(mainPack)]);
-					}).then((values) => {
-						let metadata = JSON.parse(values[0]);
-						let packData = JSON.parse(values[1]).contents;
-						let bundles = Object.keys(metadata.bundles);
-						let writes = [];
-						for (let bundle of bundles) {
-							let modules = metadata.bundles[bundle];
-							let target = Object.create(null);
-							for (let module of modules) {
-								let keys = metadata.keys[module];
-								let defaultMessages = metadata.messages[module];
-								let translations = packData[module];
-								let targetStrings;
-								if (translations) {
-									targetStrings = [];
-									for (let i = 0; i < keys.length; i++) {
-										let elem = keys[i];
-										let key = typeof elem === 'string' ? elem : elem.key;
-										let translatedMessage = translations[key];
-										if (translatedMessage === undefined) {
-											translatedMessage = defaultMessages[i];
-										}
-										targetStrings.push(translatedMessage);
+				return mkdirp(coreLocation).then(() => {
+					return Promise.all([readFile(path.join(__dirname, 'nls.metadata.json')), readFile(mainPack)]);
+				}).then((values) => {
+					let metadata = JSON.parse(values[0]);
+					let packData = JSON.parse(values[1]).contents;
+					let bundles = Object.keys(metadata.bundles);
+					let writes = [];
+					for (let bundle of bundles) {
+						let modules = metadata.bundles[bundle];
+						let target = Object.create(null);
+						for (let module of modules) {
+							let keys = metadata.keys[module];
+							let defaultMessages = metadata.messages[module];
+							let translations = packData[module];
+							let targetStrings;
+							if (translations) {
+								targetStrings = [];
+								for (let i = 0; i < keys.length; i++) {
+									let elem = keys[i];
+									let key = typeof elem === 'string' ? elem : elem.key;
+									let translatedMessage = translations[key];
+									if (translatedMessage === undefined) {
+										translatedMessage = defaultMessages[i];
 									}
-								} else {
-									targetStrings = defaultMessages;
+									targetStrings.push(translatedMessage);
 								}
-								target[module] = targetStrings;
+							} else {
+								targetStrings = defaultMessages;
 							}
-							writes.push(writeFile(path.join(coreLocation, bundle.replace(/\//g, '!') + '.nls.json'), JSON.stringify(target)));
+							target[module] = targetStrings;
 						}
-						writes.push(writeFile(translationsConfigFile, JSON.stringify(packConfig.translations)));
-						return Promise.all(writes);
-					}).then(() => {
-						perf.mark('nlsGeneration:end');
-						return result;
-					}).catch((err) => {
-						console.error('Generating translation files failed.', err);
-						return defaultResult();
-					});
+						writes.push(writeFile(path.join(coreLocation, bundle.replace(/\//g, '!') + '.nls.json'), JSON.stringify(target)));
+					}
+					writes.push(writeFile(translationsConfigFile, JSON.stringify(packConfig.translations)));
+					return Promise.all(writes);
+				}).then(() => {
+					perf.mark('nlsGeneration:end');
+					return result;
+				}).catch((err) => {
+					console.error('Generating translation files failed.', err);
+					return defaultResult(locale);
 				});
 			});
-		} catch (err) {
-			console.error('Generating translation files failed.', err);
-			return defaultResult();
-		}
+		});
+	} catch (err) {
+		console.error('Generating translation files failed.', err);
+		return defaultResult(locale);
 	}
 }