/usr/share/xul-ext/adblock-plus-element-hiding-helper/chrome/locale/dsb/composer.dtd is in xul-ext-adblock-plus-element-hiding-helper 1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | <!ENTITY preview.label "Pśeglěd">
<!ENTITY accept.label "Pšawidło za chowanje elementa pśidaś">
<!ENTITY attributes.lastchild.label "Slědne góle">
<!ENTITY expression.label "Pšawidło za chowanje elementa">
<!ENTITY domain.label "Na domenu wězaś">
<!ENTITY nodes-tree.id.label "ID">
<!ENTITY groupDisabled.warning "Toś ta filtrowa kupka "?1?", kótarejž se toś ten filter pśidawa, jo tuchylu znjemóžnjona. Móžoš hyšći filter pśidaś, ale njebuźo se nałožowaś, snaźkuli zmóžnjaš filtrowu kupku w nastajenjach Adblock Plus.">
<!ENTITY nodes-tree.class.label "klasa">
<!ENTITY advanced.label "Rozšyrjony naglěd">
<!ENTITY attributes.tagname.label "Mě elementa:">
<!ENTITY domain.none.label "Někaka domena (njepśiraźujo se)">
<!ENTITY dialog.title "Pšawidło za chowanje elementa pisaś">
<!ENTITY basic.label "Zakładny naglěd">
<!ENTITY attributes.label "Atributy pominaś">
<!ENTITY attributes.firstchild.label "Prědne góle">
<!ENTITY attributes.custom.label "Swójski CSS:">
<!ENTITY nodes-tree.node.label "Suk">
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