[UI] Update date in about card subtext. Make gradlew executable.

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

@@ -854,7 +854,7 @@
     <string name="settings_about_licenses_text">Open-Source-Lizenzen</string>
     <string name="settings_about_privacy_policy_text">Datenschutzrichtlinie</string>
     <string name="settings_about_register_title_text">E-Klassenbuch</string>
-    <string name="settings_about_title_subtext">© Kuba Szczodrzyński &amp;amp;&amp;amp; Kacper Ziubryniewicz\nSeptember 2018 - April 2020</string>
+    <string name="settings_about_title_subtext">© Kuba Szczodrzyński &amp;&amp; Kacper Ziubryniewicz\nSeptember 2018 - August 2020</string>
     <string name="settings_about_update_subtext">Klicken Sie hier, um nach Aktualisierungen zu suchen</string>
     <string name="settings_about_update_text">Aktualisierung</string>
     <string name="settings_about_version_text">Version</string>

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

@@ -856,7 +856,7 @@
     <string name="settings_about_licenses_text">Open-source licenses</string>
     <string name="settings_about_privacy_policy_text">Privacy policy</string>
     <string name="settings_about_register_title_text">E-register</string>
-    <string name="settings_about_title_subtext">© Kuba Szczodrzyński &amp;&amp; Kacper Ziubryniewicz\nSeptember 2018 - April 2020</string>
+    <string name="settings_about_title_subtext">© Kuba Szczodrzyński &amp;&amp; Kacper Ziubryniewicz\nSeptember 2018 - August 2020</string>
     <string name="settings_about_update_subtext">Click to check for updates</string>
     <string name="settings_about_update_text">Update</string>
     <string name="settings_about_version_text">Version</string>

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

@@ -919,7 +919,7 @@
     <string name="settings_about_licenses_text">Licencje open-source</string>
     <string name="settings_about_privacy_policy_text">Polityka prywatności</string>
     <string name="settings_about_register_title_text">E-dziennik</string>
-    <string name="settings_about_title_subtext">© Kuba Szczodrzyński &amp;&amp; Kacper Ziubryniewicz\nwrzesień 2018 - kwiecień 2020</string>
+    <string name="settings_about_title_subtext">© Kuba Szczodrzyński &amp;&amp; Kacper Ziubryniewicz\nwrzesień 2018 - sierpień 2020</string>
     <string name="settings_about_update_subtext">Kliknij, aby sprawdzić aktualizacje</string>
     <string name="settings_about_update_text">Aktualizacja</string>
     <string name="settings_about_version_text">Wersja</string>