Improvements & string adjustments

[abaicus]

All Submissions:

• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

• Updates View all stats link to go to the dashboard;
• Updates visits limit notice text;
• Fixes some string issues where we used concatenated strings which loose context in different languages;
• Fixes consistency with Optimole naming where sometimes OptiMole was used throughout different files;
• Fixes some other text issues in the readme files.
• Adds translations diff workflow;

Closes Codeinwp/optimole-service#1581.
Closes Codeinwp/optimole-service#1586.
Closes Codeinwp/optimole-service#1643.

How to test the changes in this Pull Request:

1. Ensure that the dashboard widget View all stats link in the main dashboard page points to the Optimole dashboard metrics page;
2. Check that the visits limit notice has the new text (see screenshot above);
3. Check that there are no errors or missing strings in the Optimole dashboard pages;

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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🌍 i18n String Review Report

📊 Summary

Category	Count
➕ Added	4
➖ Removed	6
🔄 Changed	0
Total	10

➕ Added Strings (4) - Click to expand

String	Location	Words	Suggested Match
You're nearing your %1$s-visit monthly cap on ...	inc/admin.php:647	21	%3$sYour account has been disabled due to exceeding quota.%4$s All images are being redirected to the original unoptimized URL. %5$sPlease %1$supgrade%2$s to re-activate the account.
Last optimized images	inc/admin.php:2284	3	optimized images
%s Saved	inc/admin.php:2286	2	Saved
%s smaller	inc/admin.php:2288	2	smaller
Total		28

➖ Removed Strings (6) - Click to expand

String	Location
%1$sIt seems you are close to the %2$s visits l...	inc/admin.php:647
Connect to OptiMole	inc/admin.php:867
Last	inc/admin.php:2289
Saved	inc/admin.php:2290
smaller	inc/admin.php:2291
optimized images	inc/admin.php:2292