fix: extract hard-coded string

app/src/main/java/app/passwordstore/ui/pgp/PGPKeyList.kt

@@ -45,7 +45,7 @@ fun KeyList(
         painter = painterResource(id = R.drawable.ic_launcher_foreground),
         contentDescription = "Password Store logo"
       )
-      Text("Import a key using the add button below")
+      Text(stringResource(R.string.pgp_key_manager_no_keys_guidance))
     }
   } else {
     LazyColumn(modifier = modifier) {

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

@@ -368,4 +368,5 @@
   <string name="activity_label_pgp_key_manager">PGP Key Manager</string>
   <string name="pgp_key_manager_delete_confirmation_dialog_title">Delete key?</string>
   <string name="git_utils_reset_remote_branch_title">Remote branch name</string>
+  <string name="pgp_key_manager_no_keys_guidance">Import a key using the add button below</string>
 </resources>