[UI/Translations] Make some small fixes and add more translations

app/src/main/java/pl/szczodrzynski/edziennik/homework/HomeworkAdapter.java

@@ -1,4 +1,4 @@
-package pl.szczodrzynski.edziennik.adapters;
+package pl.szczodrzynski.edziennik.homework;
 
 import android.content.Context;
 import android.graphics.PorterDuff;

app/src/main/java/pl/szczodrzynski/edziennik/homework/HomeworkDate.kt

@@ -2,7 +2,7 @@ package pl.szczodrzynski.edziennik.homework
 
 class HomeworkDate {
     companion object {
-        val CURRENT = 0
-        val PAST = 1
+        const val CURRENT = 0
+        const val PAST = 1
     }
 }

app/src/main/java/pl/szczodrzynski/edziennik/homework/HomeworkFragment.kt

@@ -95,7 +95,7 @@ class HomeworkFragment : Fragment() {
         b.tabLayout.setupWithViewPager(b.viewPager)
 
         activity.navView.bottomBar.fabEnable = true
-        activity.navView.bottomBar.fabExtendedText = "Dodaj nowe"
+        activity.navView.bottomBar.fabExtendedText = getString(R.string.add)
         activity.navView.bottomBar.fabIcon = CommunityMaterial.Icon2.cmd_plus
         activity.navView.setFabOnClickListener(View.OnClickListener {
             EventManualDialog(activity).show(app, null, null, null, EventManualDialog.DIALOG_HOMEWORK)

app/src/main/java/pl/szczodrzynski/edziennik/homework/HomeworkListFragment.kt

@@ -7,11 +7,9 @@ import android.view.ViewGroup
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
 import androidx.recyclerview.widget.LinearLayoutManager
-import kotlinx.android.synthetic.main.activity_szkolny.*
 import pl.szczodrzynski.edziennik.App
 import pl.szczodrzynski.edziennik.MainActivity
 import pl.szczodrzynski.edziennik.R
-import pl.szczodrzynski.edziennik.adapters.HomeworkAdapter
 import pl.szczodrzynski.edziennik.databinding.HomeworkListBinding
 import pl.szczodrzynski.edziennik.datamodels.Event
 import pl.szczodrzynski.edziennik.getInt