There are two icons on the login page that are not immediately logical even for sighted people. One is the symbol to get into the frontend. The title of this symbol is "Preview". In my opinion this is not a sufficient term in terms of accessibility. Apart from the fact that the semantic of this element is rather bent and should be done differently (see my issue on usage of icon font vs. SVG Sprites), it should be replaced for screenreaders at least with "Preview Frontend", "Open Website in a new window "or similar. Here it wouldn't bother the layout if sighted people knew exactly what this symbol does.
The other problem can be seen in the button with the eye. The button simply says "Show" - here it should be clearly communicated that by clicking on this button the password is displayed. For example by "Show Password".