We can export specific language translations from a NetSuite translation collection by using navigation Customization > Translation > Manage Translations
Under the ‘Strings’ subtab, you can see the ‘Export Strings’ button. On clicking the button, you will get a pop-up where you can select the checkbox: ‘Include existing translations’ to choose the specific languages you want.
Each language will be exported as a separate string file in XLIFF format. For example, if you export English to German translation, you will get a ZIP file with an XLIFF file: en-US_de-DE.xlf
This file can be used to import the strings to a different account if you have the same collection created there too. You can move the required translations only as required.