"app_name" is not translated in "af" (Afrikaans), "am" (Amharic), "ar" (Arabic), "az" (Azerbaijani), "be" (Belarusian), "bg" (Bulgarian), "bn" (Bengali), "bs" (Bosnian), "ca" (Catalan), "cs" (Czech), "da" (Danish), "de" (German), "el" (Greek), "es" (Spanish), "es-US" (Spanish: United States), "et" (Estonian), "eu" (Basque), "fa" (Persian), "fi" (Finnish), "fr" (French), "fr-CA" (French: Canada), "gl" (Galician), "gu" (Gujarati), "hi" (Hindi), "hr" (Croatian), "hu" (Hungarian), "hy" (Armenian), "in" (Indonesian), "is" (Icelandic), "it" (Italian), "iw" (Hebrew), "ja" (Japanese), "ka" (Georgian), "kk" (Kazakh), "km" (Khmer), "kn" (Kannada), "ko" (Korean), "ky" (Kyrgyz), "lo" (Lao), "lt" (Lithuanian), "lv" (Latvian), "mk" (Macedonian), "ml" (Malayalam), "mn" (Mongolian), "mr" (Marathi), "ms" (Malay), "my" (Burmese), "nb" (Norwegian Bokm?l), "ne" (Nepali), "nl" (Dutch), "pa" (Punjabi), "pl" (Polish), "pt-BR" (Portuguese: Brazil), "pt-PT" (Portuguese: Portugal), "ro" (Romanian), "ru" (Russian), "si" (Sinhala), "sk" (Slovak), "sl" (Slovenian), "sq" (Albanian), "sr" (Serbian), "sv" (Swedish), "sw" (Swahili), "ta" (Tamil), "te" (Telugu), "th" (Thai), "tl" (Tagalog), "tr" (Turkish), "uk" (Ukrainian), "ur" (Urdu), "uz" (Uzbek), "vi" (Vietnamese), "zh-CN" (Chinese: China), "zh-HK" (Chinese: Hong Kong SAR China), "zh-TW" (Chinese: Taiwan), "zu" (Zulu)

I was gettign this error after running build with apache cordova for visual studio : Severity Code
Severity Code Description Project File Line Suppression State
Error C:\Cordova\SpaceRiddle\SpaceRiddle\platforms\android\res\values\strings.xml:3: Error: "app_name" is not translated in "af" (Afrikaans), "am" (Amharic), "ar" (Arabic), "az" (Azerbaijani), "be" (Belarusian), "bg" (Bulgarian), "bn" (Bengali), "bs" (Bosnian), "ca" (Catalan), "cs" (Czech), "da" (Danish), "de" (German), "el" (Greek), "es" (Spanish), "es-US" (Spanish: United States), "et" (Estonian), "eu" (Basque), "fa" (Persian), "fi" (Finnish), "fr" (French), "fr-CA" (French: Canada), "gl" (Galician), "gu" (Gujarati), "hi" (Hindi), "hr" (Croatian), "hu" (Hungarian), "hy" (Armenian), "in" (Indonesian), "is" (Icelandic), "it" (Italian), "iw" (Hebrew), "ja" (Japanese), "ka" (Georgian), "kk" (Kazakh), "km" (Khmer), "kn" (Kannada), "ko" (Korean), "ky" (Kyrgyz), "lo" (Lao), "lt" (Lithuanian), "lv" (Latvian), "mk" (Macedonian), "ml" (Malayalam), "mn" (Mongolian), "mr" (Marathi), "ms" (Malay), "my" (Burmese), "nb" (Norwegian Bokm?l), "ne" (Nepali), "nl" (Dutch), "pa" (Punjabi), "pl" (Polish), "pt-BR" (Portuguese: Brazil), "pt-PT" (Portuguese: Portugal), "ro" (Romanian), "ru" (Russian), "si" (Sinhala), "sk" (Slovak), "sl" (Slovenian), "sq" (Albanian), "sr" (Serbian), "sv" (Swedish), "sw" (Swahili), "ta" (Tamil), "te" (Telugu), "th" (Thai), "tl" (Tagalog), "tr" (Turkish), "uk" (Ukrainian), "ur" (Urdu), "uz" (Uzbek), "vi" (Vietnamese), "zh-CN" (Chinese: China), "zh-HK" (Chinese: Hong Kong SAR China), "zh-TW" (Chinese: Taiwan), "zu" (Zulu) [MissingTranslation] SpaceRiddle 1

In order to resolve this error I had to update problem file : C:\Cordova\SpaceRiddle\SpaceRiddle\platforms\android\res\values\strings.xml 
with adding translatable="false" so final file looks like :

<?xml version='1.0' encoding='utf-8'?>
<resources>
    <string name="app_name" translatable="false">SpaceRiddle</string>
    <string name="launcher_name" translatable="false">@string/app_name</string>
    <string name="activity_name" translatable="false">@string/launcher_name</string>
</resources>