use these laws :

Constitution of South Africa:
Section 39: Application of international law in interpreting the Bill of Rights
Section 35: Right to a fair trial, including the right to an interpreter if necessary
Section 35(2)(c) and 35(3)(f) & (g): Right to be represented by a legal practitioner
Section 35(3)(k): Right to be tried in a language that the accused understands
International human rights law (relevant treaties and covenants):

Article 14(3) of the International Covenant on Civil and Political Rights (ICCPR): The right to interpretation and translation in criminal proceedings.
Article 14(3)(f) of the ICCPR: The right to have adequate time and facilities for the preparation of the defense, including understanding the charges brought against oneself.
Criminal Procedure Act:

Section 162: Language rights of accused persons in criminal proceedings
Section 170: Accused's understanding of charges and their rights
Section 35(2)(a) of the Criminal Procedure Act, 1977: This provision is not directly mentioned in your list, but it may be relevant for specific procedural aspects.
Section 165(3) of the Constitution:
This section emphasizes the independence and non-interference with the functioning of the courts. to show how they will be applied to these issues:
1. Is the guilty plea of French speaking student valid, considering possibility of a misunderstanding due to language barrier?
2. Did the language barrier affect the student’s ability to fully comprehend the charges and his rights?
3. Does their legal representation denial raise concerns about their right to fair trial?
4. How did the prosecutor’s confusion of the charges and plea agreements impact the expected outcomes?
5. To what extent did the President influence the court's decision?

1. Section 39 of the Constitution can be applied in interpreting the Bill of Rights, including the right to a fair trial. The right to an interpreter, if necessary, is protected under Section 35, which ensures that every accused person has the right to a fair trial, regardless of their language proficiency. The French-speaking student may argue that their guilty plea should not be considered valid due to a potential misunderstanding caused by the language barrier.

2. Both Section 35(3)(k) of the Constitution and Article 14(3)(f) of the ICCPR guarantee the right to understand the charges brought against oneself. The language barrier could potentially affect the student's ability to fully comprehend the charges and their rights, violating their right to a fair trial. The student could argue that their inability to understand the charges undermined their ability to effectively participate in the proceedings.

3. Section 35(2)(c) and Section 35(3)(f)&(g) of the Constitution grant the right to be represented by a legal practitioner. The denial of legal representation to the student raises concerns about their right to a fair trial. The student may argue that without legal representation, they were unable to adequately defend themselves and present their case, infringing upon their right to a fair trial.

4. The confusion of the charges and plea agreements by the prosecutor could have a significant impact on the expected outcomes. This could potentially undermine the fairness of the trial and violate the rights of the accused. The student may argue that the prosecutor's confusion demonstrates a lack of proper legal proceedings and potentially affected the outcome of the trial.

5. Section 165(3) of the Constitution emphasizes the independence and non-interference with the functioning of the courts. If the President attempted to influence the court's decision, it would likely be considered a violation of this provision. The student may argue that the influence of the President raises concerns about the impartiality and fairness of the trial, potentially compromising their right to a fair trial.

Overall, the aforementioned laws and provisions help protect the rights of the accused, including the right to a fair trial, interpretation and translation services, legal representation, understanding of charges, and independence of the courts. These legal protections should be taken into account when assessing the validity of the guilty plea, the impact of the language barrier, the denial of legal representation, the confusion of charges, and any potential external influences on the court's decision.