Feature: Improve the alt-text of charts by utilising the dynamic chart titles

[JT-39]

Feature Overview

Each indicator has its own chart title which is dynamically updated in the chart when an indicator is changed. This title could be used in the alt-text of the charts to provide some extra information.

Problem

Currently the charts alt-texts are static for each chart instance. This is okay but not that useful for screen readers.

Proposed Solution

The chart title can be integrated into the chart's alt-text to provide a little more customised information.

Impact

Should improve the understanding of the app for people who use screen readers.

Additional Information

This should quite easily be done by sharing the chart title to the UI part of the app where the alt-text is set. Will have to state that it is the chart title and will follow a similar formatting style, using the paste() function to integrate the text.