Fix(l10n): Update translations from Transifex

apps/comments/l10n/cs.js

apps/comments/l10n/cs.json

apps/encryption/l10n/cs.js

apps/encryption/l10n/cs.json

apps/settings/l10n/fr.js

apps/settings/l10n/fr.json

apps/settings/l10n/sl.js

apps/settings/l10n/sl.json

core/l10n/cs.js

core/l10n/cs.json

core/l10n/zh_CN.js

core/l10n/zh_CN.json