Schedule Pages incorrectly spelled "September" as "Septemer"

[aheber]

Describe the bug
Spelling mistake in our Scheduling VF pages.

declarative-lookup-rollup-summaries/dlrs/main/pages/rollupscheduledcalculatemdt.page

Line 125 in f61747f

<apex:selectOption itemValue="9" itemLabel="Septemer" />

declarative-lookup-rollup-summaries/dlrs/main/pages/rollupscheduledcalculate.page

Line 124 in f61747f

<apex:selectOption itemValue="9" itemLabel="Septemer" />

To Reproduce
Create a rollup and Schedule the Full Caculate, looking at the Month selection you will see that September is spelled incorrectly.

Expected behavior
September should be spelled correctly.

Screenshots

[MSGanesh23]

Hi, I am new to open source contribution. I looked at the issue you mentioned and renamed in the respective files. Can you review my PR #1529 ?