chore(l10n): update Polish translations

Currently translated at 100.0% (48 of 48 strings)

Translation: Fossify/Keyboard
Translate-URL: https://hosted.weblate.org/projects/fossify/keyboard/pl/
Via: Weblate

Author: Aga-C

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

@@ -47,4 +47,5 @@
     <string name="flags">Flagi</string>
     <string name="smileys_and_emotions">Buźki i emocje</string>
     <string name="show_emoji_key">Pokazuj klawisz emoji</string>
+    <string name="show_language_switch_key">Pokazuj klawisz przełączania języka</string>
 </resources>