Fonts: Change light gray font to dark gray across app

[mariobehling]

There are a number of places with light gray color. This is often difficult to see, especially if it is not bold. However, there is no point of making more and more text bold.

Please change light gray color to a dark gray that is easier to read.

[nlok5923]

Working on it sir.

[spy-1234]

Sir, I want to working on the issue.

[yukti72]

Is this issue still open?

[Radhika14soni]

Is this issue still open?

[mariobehling]

A number of areas are still light gray, e.g.:

• my tickets
• my sessions
• headings in invoices