Script to wrap labels in XMSG is missing some strings

Some user-facing strings displayed in the CEF frontend aren't getting wrapped in XMSG with the new wrapper script. Here's a list of all the strings that didn't get wrapped in Linear_RegressionGui.html:

- [x] "Customize" (on the button on the Setup page)
- [x] "Omit a model constant"
- [x] "Use a weight variable for weighted least squares"
- [x] "Use regularized regression"
- [x] "Enter value of alpha"
- [x] "Standardize predictor variables"
- [x] "Use cross-validation to determine model parameters"
- [x] "Simpler model"
- [x] "Model with lower in-sample mean squared error"
- [x] "Set seed" (under the cv.glmnet portion)
- [x] "Use cross-validation to determine estimates of model quality"
- [x] "Set seed" (on the cross-validation tab)
- [x] "Display graphs"