Fix translation strings

core/l10n/ast.js

core/l10n/ast.json

core/l10n/bg_BG.js

core/l10n/bg_BG.json

core/l10n/bs.js

core/l10n/bs.json

core/l10n/ca.js

core/l10n/ca.json

core/l10n/cs_CZ.js

core/l10n/cs_CZ.json

core/l10n/da.js

core/l10n/da.json

core/l10n/el.js

core/l10n/el.json

core/l10n/en_GB.js

core/l10n/en_GB.json

core/l10n/es.js

core/l10n/es.json

core/l10n/es_AR.js

core/l10n/es_AR.json