diff --git a/app/build.gradle b/app/build.gradle
index 82a4c23a..eb3165e8 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -14,8 +14,9 @@ android {
         targetSdkVersion version_setup_targetSdk
         buildConfigField "boolean", "IS_TEST_BUILD", "false"
         buildConfigField "boolean", "IS_GPLAY_BUILD", "false"
-        buildConfigField "String[]", "APPLICATION_LANGUAGES", "${getUsedAndroidLanguages()}"
+        buildConfigField "String[]", "DETECTED_ANDROID_LOCALES", "${findUsedAndroidLocales()}"
         buildConfigField "String", "GITHASH", "\"${getGitHash()}\""
+        resValue "string", "manifest_package_id", "com.github.dfa.diaspora_android"
 
         applicationId "com.github.dfa.diaspora_android"
         versionName "1.1.0"
@@ -53,6 +54,7 @@ android {
         flavorGplay {
             buildConfigField "boolean", "IS_GPLAY_BUILD", "true"
         }*/
+
         flavorTest {
             applicationId "com.github.dfa.secondlion"
             resValue 'string', 'app_name', "secondlion*"
diff --git a/app/src/main/java/com/github/dfa/diaspora_android/activity/AspectListFragment.java b/app/src/main/java/com/github/dfa/diaspora_android/activity/AspectListFragment.java
index 5e615f2a..9da6a6de 100644
--- a/app/src/main/java/com/github/dfa/diaspora_android/activity/AspectListFragment.java
+++ b/app/src/main/java/com/github/dfa/diaspora_android/activity/AspectListFragment.java
@@ -167,7 +167,7 @@ public class AspectListFragment extends ThemedFragment implements OnSomethingCli
             final DiasporaAspect aspect = aspectList[position];
             holder.title.setText(aspect.name);
             if (position % 2 == 1) {
-                holder.root.setBackgroundColor(isAmoledColorMode ? Color.BLACK : ContextUtils.get().color(R.color.alternate_row_color));
+                holder.root.setBackgroundColor(isAmoledColorMode ? Color.BLACK : ContextUtils.get().rcolor(R.color.alternate_row_color));
                 holder.title.setTextColor(isAmoledColorMode ? Color.GRAY : Color.BLACK);
             } else {
                 holder.root.setBackgroundColor(isAmoledColorMode ? Color.BLACK : Color.WHITE);
diff --git a/app/src/main/java/com/github/dfa/diaspora_android/activity/TagListFragment.java b/app/src/main/java/com/github/dfa/diaspora_android/activity/TagListFragment.java
index 8502be10..7e6cb353 100644
--- a/app/src/main/java/com/github/dfa/diaspora_android/activity/TagListFragment.java
+++ b/app/src/main/java/com/github/dfa/diaspora_android/activity/TagListFragment.java
@@ -166,7 +166,7 @@ public class TagListFragment extends ThemedFragment implements OnSomethingClickL
             final String tag = followedTagsList[position];
             holder.title.setText(tag);
             if (position % 2 == 1) {
-                holder.root.setBackgroundColor(isAmoledColorMode ? Color.BLACK : ContextUtils.get().color(R.color.alternate_row_color));
+                holder.root.setBackgroundColor(isAmoledColorMode ? Color.BLACK : ContextUtils.get().rcolor(R.color.alternate_row_color));
                 holder.title.setTextColor(isAmoledColorMode ? Color.GRAY : Color.BLACK);
             } else {
                 holder.root.setBackgroundColor(isAmoledColorMode ? Color.BLACK : Color.WHITE);
diff --git a/app/src/main/java/com/github/dfa/diaspora_android/ui/theme/ThemedColorPickerPreference.java b/app/src/main/java/com/github/dfa/diaspora_android/ui/theme/ThemedColorPickerPreference.java
index 6b61210e..524c1b65 100644
--- a/app/src/main/java/com/github/dfa/diaspora_android/ui/theme/ThemedColorPickerPreference.java
+++ b/app/src/main/java/com/github/dfa/diaspora_android/ui/theme/ThemedColorPickerPreference.java
@@ -50,7 +50,7 @@ public class ThemedColorPickerPreference extends Preference implements Themeable
             AppSettings appSettings = AppSettings.get();
             String key = getKey();
 
-            int color = ContextUtils.get().color(R.color.primary);
+            int color = ContextUtils.get().rcolor(R.color.primary);
             if ((appSettings.isKeyEqual(key, R.string.pref_key__primary_color_shade))) {
                 color = appSettings.getPrimaryColor();
             } else if ((appSettings.isKeyEqual(key, R.string.pref_key__accent_color_shade))) {
diff --git a/app/src/main/java/net/gsantner/opoc/preference/nonsupport/LanguagePreference.java b/app/src/main/java/net/gsantner/opoc/preference/nonsupport/LanguagePreference.java
index a47a1a8d..7b4616b1 100644
--- a/app/src/main/java/net/gsantner/opoc/preference/nonsupport/LanguagePreference.java
+++ b/app/src/main/java/net/gsantner/opoc/preference/nonsupport/LanguagePreference.java
@@ -114,7 +114,7 @@ public class LanguagePreference extends ListPreference {
         // Fetch readable details
         ContextUtils contextUtils = new ContextUtils(context);
         List<String> languages = new ArrayList<>();
-        Object bcof = contextUtils.getBuildConfigValue("APPLICATION_LANGUAGES");
+        Object bcof = contextUtils.getBuildConfigValue("DETECTED_ANDROID_LOCALES");
         if (bcof instanceof String[]) {
             for (String langId : (String[]) bcof) {
                 Locale locale = contextUtils.getLocaleByAndroidCode(langId);
diff --git a/app/src/main/java/net/gsantner/opoc/util/ContextUtils.java b/app/src/main/java/net/gsantner/opoc/util/ContextUtils.java
index efbd8423..a37102bc 100644
--- a/app/src/main/java/net/gsantner/opoc/util/ContextUtils.java
+++ b/app/src/main/java/net/gsantner/opoc/util/ContextUtils.java
@@ -100,18 +100,23 @@ public class ContextUtils {
         public static final String ARRAY = "array";
         public static final String DIMEN = "dimen";
         public static final String MENU = "menu";
+        public static final String BOOL = "bool";
         public static final String RAW = "raw";
     }
 
-    public String str(@StringRes int strResId) {
+    public String rstr(@StringRes int strResId) {
         return _context.getString(strResId);
     }
 
-    public Drawable drawable(@DrawableRes int resId) {
+    public String rstr(String strResKey) {
+        return rstr(getResId(ResType.STRING, strResKey));
+    }
+
+    public Drawable rdrawable(@DrawableRes int resId) {
         return ContextCompat.getDrawable(_context, resId);
     }
 
-    public int color(@ColorRes int resId) {
+    public int rcolor(@ColorRes int resId) {
         return ContextCompat.getColor(_context, resId);
     }
 
@@ -159,14 +164,23 @@ public class ContextUtils {
     }
 
     /**
-     * Get field from PackageId.BuildConfig
+     * Get field from ${applicationId}.BuildConfig
      * May be helpful in libraries, where a access to
      * BuildConfig would only get values of the library
-     * rather than the app ones
+     * rather than the app ones. It awaits a string resource
+     * of the package set in manifest (root element).
+     * Falls back to applicationId of the app which may differ from manifest.
      */
     public Object getBuildConfigValue(String fieldName) {
+        String pkg;
         try {
-            Class<?> c = Class.forName(_context.getPackageName() + ".BuildConfig");
+            pkg = rstr("manifest_package_id");
+        } catch (Resources.NotFoundException ex) {
+            pkg = _context.getPackageName();
+        }
+        pkg += ".BuildConfig";
+        try {
+            Class<?> c = Class.forName(pkg);
             return c.getField(fieldName).get(null);
         } catch (Exception e) {
             e.printStackTrace();
@@ -174,7 +188,7 @@ public class ContextUtils {
         }
     }
 
-    public boolean getBuildConfigBoolean(String fieldName, boolean defaultValue) {
+    public boolean bcbool(String fieldName, boolean defaultValue) {
         Object field = getBuildConfigValue(fieldName);
         if (field != null && field instanceof Boolean) {
             return (Boolean) field;
@@ -182,27 +196,35 @@ public class ContextUtils {
         return defaultValue;
     }
 
+    public String bcstr(String fieldName, String defaultValue) {
+        Object field = getBuildConfigValue(fieldName);
+        if (field != null && field instanceof String) {
+            return (String) field;
+        }
+        return defaultValue;
+    }
+
     public boolean isGooglePlayBuild() {
-        return getBuildConfigBoolean("IS_GPLAY_BUILD", true);
+        return bcbool("IS_GPLAY_BUILD", true);
     }
 
     public boolean isFossBuild() {
-        return getBuildConfigBoolean("IS_FOSS_BUILD", false);
+        return bcbool("IS_FOSS_BUILD", false);
     }
 
     // Requires donate__bitcoin_* resources (see below) to be available as string resource
     public void showDonateBitcoinRequest(@StringRes final int strResBitcoinId, @StringRes final int strResBitcoinAmount, @StringRes final int strResBitcoinMessage, @StringRes final int strResAlternativeDonateUrl) {
         if (!isGooglePlayBuild()) {
             String btcUri = String.format("bitcoin:%s?amount=%s&label=%s&message=%s",
-                    str(strResBitcoinId), str(strResBitcoinAmount),
-                    str(strResBitcoinMessage), str(strResBitcoinMessage));
+                    rstr(strResBitcoinId), rstr(strResBitcoinAmount),
+                    rstr(strResBitcoinMessage), rstr(strResBitcoinMessage));
             Intent intent = new Intent(Intent.ACTION_VIEW);
             intent.setData(Uri.parse(btcUri));
             intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
             try {
                 _context.startActivity(intent);
             } catch (ActivityNotFoundException e) {
-                openWebpageInExternalBrowser(str(strResAlternativeDonateUrl));
+                openWebpageInExternalBrowser(rstr(strResAlternativeDonateUrl));
             }
         }
     }
@@ -239,7 +261,7 @@ public class ContextUtils {
     @SuppressWarnings("RestrictedApi")
     public void setTintColorOfButton(AppCompatButton button, @ColorRes int resColor) {
         button.setSupportBackgroundTintList(ColorStateList.valueOf(
-                color(resColor)
+                rcolor(resColor)
         ));
     }
 
@@ -272,7 +294,7 @@ public class ContextUtils {
             return new SimpleMarkdownParser()
                     .parse(_context.getResources().openRawResource(rawMdFile),
                             prepend, SimpleMarkdownParser.FILTER_ANDROID_TEXTVIEW)
-                    .replaceColor("#000001", color(getResId(ResType.COLOR, "accent")))
+                    .replaceColor("#000001", rcolor(getResId(ResType.COLOR, "accent")))
                     .removeMultiNewlines().replaceBulletCharacter("*").getHtml();
         } catch (IOException e) {
             e.printStackTrace();
diff --git a/build.gradle b/build.gradle
index f86d3bbf..3f0532f1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -63,7 +63,7 @@ task copyRepoFiles(type: Copy) {
 
 @SuppressWarnings(["UnnecessaryQualifiedReference", "SpellCheckingInspection", "GroovyUnusedDeclaration"])
 // Returns used android languages as a buildConfig array: {'de', 'it', ..}"
-static String getUsedAndroidLanguages() {
+static String findUsedAndroidLocales() {
     Set<String> langs = new HashSet<>()
     new File('.').eachFileRecurse(groovy.io.FileType.DIRECTORIES) {
         final foldername = it.name
@@ -80,12 +80,13 @@ static String getUsedAndroidLanguages() {
 
 ext.getGitHash = { ->
     try {
-        def stdout = new ByteArrayOutputStream() exec {
+        def stdout = new ByteArrayOutputStream()
+        exec {
             commandLine 'git', 'rev-parse', 'HEAD'
             standardOutput = stdout
         }
         return stdout.toString().trim()
-    } catch (Exception e) {
-        return '???'
+    } catch (Exception ignored) {
+        return 'unknown'
     }
 }