oh. okey, linked is prepojeny

PeterS, maybe these lines are better?
"Show linked images noname@abc.xyx: not known" (original doesn't end with not known email, just not known?) => "Zobraziť prepojené obrázky noname@abc.xyx: neznáma e-mailová adresa"
"Save noname@abc.xyx as a known email" = > "Uložiť noname@abc.xyx ako známu e-mailovú adresu"
And translated new strings:
<!-- strings_message_display.xml -->
<string name="message_display_hide_attachments">Skryť prílohy</string>
<string name="message_display_menu_mark_star_off">Odstrániť hviezdičku</string>
<string name="message_display_menu_mark_star_on">Označiť s hviezdičkou</string>
<plurals name="message_display_show_attachments_plural">
<item quantity="one">Zobraziť %1$d prílohu</item>
<item quantity="few">Zobraziť %1$d prílohy</item>
<item quantity="other">Zobraziť %1$d príloh</item>
</plurals>
<!-- strings_prefs.xml -->
<string name="prefs_ui_attachments_collapse">Skryť prílohy</string>
<string name="prefs_ui_attachments_collapse_summary">Skryť prílohy pre zobrazenie textu správ</string> // PeterS, any better idea for "Initially, to see message text right away"?
Kostya, after PeterS approves new text, then please take it.