Well, Bernie could be in for a rough ride.
Germany has ratified the OECD Anti Bribery Convention and implemented it by adopting the above mentioned IntBestG. The convention deals with the "active" side of corruption in international business transactions and encourages legislative efforts aimed to combat foreign corruption.
There's some good scope of punishments in German Law for him if he's found guilty:
Penalties
The penalties for the aforementioned offences range from fines to imprisonment and vary substantially depending on the nature and seriousness of the offence.
Individuals
The offence of bribing a public official is punishable with a fine or a prison term of up to three years. In its aggravated form (Sec. 334 StGB), the minimum prison sentence for bribing a public official is three months, while the maximum sentence is five years. Bribing judges or arbitrators is, under certain circumstances, punishable with higher prison sentences (see Sec. 333 (2), Sec. 334 (2) StGB).
In especially serious cases, the prison sentence for bribing a public official is between one year and ten years (Sec. 335 (1) StGB). An especially serious case within the meaning of this provision typically occurs, inter alia, when the offence relates to a major benefit (starting at around 10,000 Euros).
Bribing in commercial practice is punishable with fines or imprisonment of up to three years. In especially serious cases, the sentencing range is from three months to five years in prison (Sec. 300 StGB).
The punishment for bribing delegates is imprisonment not exceeding five years or a fine. In addition to a sentence of imprisonment of at least six months the court may order the loss of the ability to hold public office, to vote and to be elected in public elections (Sec. 108e (2) StGB).
Plus, looks like there's scope to add in charges:
V Associated offences: financial record keeping and money laundering
Past cases of corruption have shown that bribery is in many instances accompanied by other criminal offences including fraud (Sec. 263 et seq. StGB), embezzlement and abuse of trust (Sec. 266 StGB), restricting competition through agreements in the context of public bids (Sec. 298 StGB) and tax evasion (Sec. 370 of the German Fiscal Code). Moreover, bribery is explicitly mentioned in the provision regarding money laundering (Sec. 261 (1) No. 2 (a) StGB).
With Germany taking a public "we're the leaders on cracking down on this sort of thing" approach - it'll be intersting to see what results from all this.