Corrected 2 spelling mistakes (Dutch) (#367)

* Corrected spelling mistake

* Corrected another spelling mistake

Author: Z3r0byte

app/src/main/res/values-nl/strings.xml

@@ -2,7 +2,7 @@
 <!-- Translation by Carsten and DoraKlikOpDora -->
 <resources>
     <string name="action_settings">Instellingen</string>
-    <string name="action_clearmap">Leeg de map</string>
+    <string name="action_clearmap">Leeg de kaart</string>
     <string name="action_logout">Uitloggen</string>
     <string name="pref_theme">PresetTheme</string>
     <string name="logout_prompt_message">Wil je echt uitloggen?</string>
@@ -24,7 +24,7 @@
     <string name="pref_cat_service">Laat de app op de achtergrond lopen</string>
     <string name="pref_service_enable_title">Ingeschakeld</string>
     <string name="pref_service_refresh_title">Ververstijd</string>
-    <string name="pref_service_refresh_summary">Hoe vaak de applicatie de kaart hernieuwd in seconden.</string>
+    <string name="pref_service_refresh_summary">Hoe vaak de applicatie de kaart herniewt in seconden.</string>
     <string name="pref_cat_other">Overig</string>
     <string name="pref_theme_button">Thema</string>
     <string name="toast_credentials">Ongeldige gegevens ingevuld! Kan niet inloggen!</string>
@@ -80,7 +80,7 @@
     <string name="notification_service_pokemon_in_area">%1$d Pokémons in de buurt:</string>
     <string name="meters">meter</string>
     <string name="gym">Gym</string>
-    <string name="button_ok">Okay</string>
+    <string name="button_ok">Oké</string>
     <string name="notification_service_inbox_line">%1$s (%2$d minuten, %3$d meter)</string>
     <string name="toast_still_searching">Searching&#8230; Al %1$d Pokémons gevonden. Nog steeds zoekend..</string>
     <string name="preset_themes_title">Ingesteld thema</string>