Text: conversions can be performed on an entire batch of files simply by adding them to the list (via the add button, menu item, or drag and drop) and clicking the convert button or menu item."

Correct capitalization: Conversions can be performed on an entire batch of files simply by adding them to the list (via the Add button, menu item, or drag and drop) and clicking the Convert button or menu item."

Text: you can bring a limited amount of liquid, cream and gel through security:

Correct capitalization: You can bring a limited amount of liquid, cream and gel through security:

Text: what if google folds? what if they do evil things with all of it?

Correct capitalization: What if Google folds? What if they do evil things with all of it?

Text: for the pestsurf sandy pond, which is in direct contact with shallow groundwater, transport in groundwater is the dominating mechanism.

Correct capitalization:
For the PestSurf sandy pond, which is in direct contact with shallow groundwater, transport in groundwater is the dominating mechanism.