Fix and comment the code of MT5 Bollinger Band Indicators based on Currency Strength custom indicators

Hi! I created a set of indicators.

I need a developer to review these indicators, stabilize them, explain and comment the code so that I can understand every line.

I have two indicators (downloaded) that define currency strength. 

One draws strength for all currencies. Modifications of this indicator only calculate and draw for one currency.

Based on this last indicator, I can extract the currency strength of one currency, and apply bollinger bands to it. I use second custom indicator for this.

You see the indicator for the strength of EUR below, with bollinger bands around it. Problem is the indicator does not draw for all currencies. As you see in the screen below. 

I created Currency strength indicators for every major currency (8 currencies). Then I created indicators for every one of these indicators that draw the bands.

If we can make the indicators robust, with proper error management, value printing and debugging options, we can then further develop an EA on it as a next step. This will be the final goal.

I look forward to your reply!