Ok. You should ensure that all evidence is in English. If it is not in English then it should be translated. From the Home Office website:
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If you send us a document that is not in English or Welsh, it must be accompanied by a full translation that can be independently verified by us. Each translated document must contain:
- confirmation from the translator that it is an accurate translation of the original document;
-the date of the translation;
- the translator's full name and signature; and
- the translator's contact details.
If you do not submit translations of all supporting documents, this may result in your application being delayed or refused.
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I would ensure that you have something from your employer to confirm the holiday time that you have booked and you could also include the wedding invitation. Make clear on the application that your wife will be going first to help the bride with preparations. Showing that your wife does not work and that you are fully financially supporting the trip will be the simplest way to proceed - just make sure that both applications have the full evidence available, marriage certificate included, and a letter of support should be included from you in your wife's application.
Make sure that you use the last section in the online application where it allows you to provide further information.
Remember, all evidence in English, evidence the reason for the trip and evidence that you will be leaving the UK to return to work. Your wife being shown to be financially dependant on you will also help matters as it means she is likely to return with you and also confirm the intended return date and that you both intend to return together.
I would not limit what your wife can spend from your joint account - the caseworker would consider that your wife has equal access and you should not say anything other than this.
Bank statements for the most recent 3-month period would be sufficient.