This thread is resolved. Here is a description of the problem and solution.
Translate logo from Astra theme.
-go to WPML > Theme and plugins localization. Be sure that 'Translate themes and plugins using WPML's String Translation only (don't load .mo files)' is selected. -under Strings in the themes section, select your theme. -click 'Scan selected themes for strings' -to WPML > String Translation and on the bottom of the page click 'Translate texts in admin screens »' -search for 'theme_mods_astra_child'. under it select 'custom_logo'. -click 'Apply' at the bottom of the page. -find and translate that string again. check 'translation is complete' . click 'save'
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