As of my last knowledge update in January 2022, the Samsung Galaxy On5 SM-G5700 was released with specific regional firmware versions, and obtaining a global ROM for this device might not be straightforward due to regional and carrier-specific variations. It’s essential to note that modifying or flashing firmware on your device carries risks, including the potential to void your warranty or cause unintended issues.

If you are seeking a ROM that includes fixes for Google Play Services (CH Play), full language support, and other enhancements, consider the following general steps:

1. Official Sources:
   • Check the official Samsung website or contact Samsung support to inquire about any available updates or firmware that include the features you’re looking for. Manufacturers often release updates to address issues and enhance device functionality.
2. XDA Developers Forums:
   • The XDA Developers forums are a community where users share custom ROMs and modifications. Look for your specific device model (SM-G5700) in the forums to see if any developers have created custom ROMs that meet your requirements. Always ensure that the ROM is from a reputable source to avoid potential security risks.
3. Custom ROMs with GApps:
   • Some custom ROMs come pre-loaded with Google Apps (GApps) and may have language support improvements. Popular custom ROMs like LineageOS might be available for your device, but compatibility should be confirmed before installation.

Before proceeding with any firmware modification, I recommend checking for the latest information on reputable forums, ensuring compatibility with your specific model, and understanding the potential risks involved. Additionally, make sure to back up your data before attempting any firmware modifications.

Please note that information and circumstances may have changed since my last update in January 2022, so it’s advisable to verify the latest details from official sources and community forums.