Installment text often looks different then contribution text due to inconsistent use of label tag

Due to the way frequency intervals are dynamically added to the contribution page, we often get the text: "I will contribute this amount" wrapped in a label tag and the following text "every month" not wrapped in a label tag. This inconsistency often creates a visual difference which could be fixed using a CSS work-around... but since both parts of the text are in fact labels, it is more elegant to fix it in the code.

Here's the HTML snippet:

<input id="is_recur" name="is_recur" value="1" class="crm-form-checkbox" type="checkbox"> <label for="is_recur">I want to contribute this amount</label> every month