Reduce false positives from 'detect-non-i18n-string' rule

The current ruleset results in a number of false positives.

The rule needs to be refined in order to make the results more accurate.

Examples of false positives;

Dropzone.autoDiscover = false;

this.active_backdrop = null;

state.isVisible = true;

window.activeVueResources += 1;

let namespacePrefix = '';

this.usersPath = '/autocomplete/users.json';

constructor(container = '.project-home-panel') {

let url = 'http://example.com'