Reenable build failure on lintErrors

app/build.gradle

@@ -8,7 +8,7 @@ android {
         minSdkVersion 21
         //noinspection ExpiredTargetSdkVersion
         targetSdkVersion 26
-        versionCode 5
+        versionCode 10
         versionName "1.0"
     }
 
@@ -19,12 +19,13 @@ android {
         }
     }
 
-    lintOptions {
-        abortOnError true
-        warning "MissingTranslation"
-    }
 
     dependencies {
         implementation "com.android.support:support-compat:26.1.0"
     }
+    namespace 'de.rochefort.childmonitor'
+    lint {
+        abortOnError true
+        warning 'MissingTranslation'
+    }
 }