You may have already updated the translation text in one of your apps Client Translations Panel, but you notice that texts are not translated in the app so it seems the translations are not being applied.
If the translations were already updated and saved following the Change Text Using Your Client Translations Panel guidelines, it is likely the device is using a different language.
One needs to keep in mind that translated content will be displayed based on the language the user has selected on their device. Thus, If one has the device set to Spanish, the Spanish translation will be applied. If you have it set to English, the English translation will be applied, and so on.
An important caveat is to ensure the device language is using the same locale as the one applied in the Translations Panel. For example, if one updates the translations for Portuguese (Brazil), it will only reflect on devices that have the language set to this locale as well. Devices that are set to a different locale such as Portuguese (Portugal) would display other text since those are different locales on the Translations Panel.
Once the device language is updated to match the locale selected in the Translation Panel, the translated text should be displayed. If you are testing from multiple devices, please make sure that all devices are set to this language.
To test the app on different devices you can use a tool such as Browserstack.