fix(translations): Capitalize Czech language name

The string for the Czech language in `languages.xml` has been corrected from "czech" to "Czech" to follow proper capitalization.

Author: CreativeCodeCat

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

@@ -2,7 +2,7 @@
 <resources>
     <string name="lang_arabic">Arabic</string>
     <string name="lang_dutch">Dutch</string>
-    <string name="lang_czech">czech</string>
+    <string name="lang_czech">Czech</string>
     <string name="lang_english">English</string>
     <string name="lang_french">French</string>
     <string name="lang_german">German</string>