Update source file strings.xml

Author: Wavesonics

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

@@ -360,6 +360,13 @@
     <string name="pin_show_description">Show PIN</string>
     <string name="pin_hide_description">Hide PIN</string>
 
+    <!-- Alpha-numeric PIN -->
+    <string name="pin_creation_alphanumeric_label">Enable alpha-numeric PIN</string>
+    <string name="pin_creation_alphanumeric_help_description">Learn about alpha-numeric PINs</string>
+    <string name="pin_creation_short_warning">Short PINs are less secure. Consider using 6+ characters.</string>
+    <string name="pin_alphanumeric_help_title">Alpha-numeric PINs</string>
+    <string name="pin_alphanumeric_help_message">Alpha-numeric PINs allow letters (a-z, A-Z) in addition to digits (0-9).\n\nThis dramatically increases security:\n\n- A 4-digit numeric PIN has 10,000 possible combinations\n- A 4-character alpha-numeric PIN has over 14 million combinations\n\nUsing letters and numbers together makes your PIN much harder to guess or brute-force.</string>
+
     <string name="pin_create_notification_rationale_title">Allow Notifications</string>
     <string name="pin_create_notification_rationale_text">SnapSafe only uses notifications to keep you in control of
         work it may be doing in the background, or to inform you of the current security status. It is strongly