Further code cleanup, injected PrefsManager, libs update

app/build.gradle

@@ -24,14 +24,15 @@ apply plugin: 'kotlin-kapt'
 apply plugin: "androidx.navigation.safeargs.kotlin"
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.3"
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
     defaultConfig {
         applicationId "com.rtbishop.look4sat"
         minSdkVersion 21
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode 18
         versionName '1.4.8'
+        resConfigs "en", "ru"
     }
     buildTypes {
         release {