Соответствующая норма
Practice Relating to Rule 99. Deprivation of Liberty
Section C. Prompt information on the reasons for deprivation of liberty
In 2006, in its initial report to the Committee against Torture, Serbia stated that “a person deprived of liberty must be informed immediately in his/her own language or in a language he/she understands of the reasons of the deprivation of liberty”. 
Serbia, Initial report to the Committee against Torture, 8 February 2007, UN Doc. CAT/C/SRB/1, submitted 3 May 2006, as amended by CAT/C/SRB/2/Corr.1, 23 September 2008, § 275; see also § 284.