Simplify a bit the markup in themes management

Signed-off-by: emanuele <emanuele45@gmail.com>
Simplify the markup of the theme list page as well

Signed-off-by: emanuele <emanuele45@gmail.com>
Slightly inconsistent with the rest of the GUI, but the help icon looks nice where there should be the "X" to delete the theme

Signed-off-by: emanuele <emanuele45@gmail.com>
Broken error template (use the same variable name is never a cleaver idea lol)

Signed-off-by: emanuele <emanuele45@gmail.com>
Again markup of themes pages

Signed-off-by: emanuele <emanuele45@gmail.com>
Theme settings

Signed-off-by: emanuele <emanuele45@gmail.com>
Another round of markup and inline styles

Signed-off-by: emanuele <emanuele45@gmail.com>