title: Replacing some data from a column with another column data only where a certain condition is met in R (dplyr)
body: <p>I have an extensive data frame with 30+ columns and 10000+ rows. Today I want to focus in two columns: <code>languages</code> and <code>languages2</code>:</p>
  <pre><code>languages             languages2
  
  Spanish                  NA
  Spanish                  NA
  Other (specify)        French
  Other (specify)        German
  Other (specify)        Russian
  English                  NA
  Other (specify)        Portuguese
  English                  NA
  (...)
  </code></pre>
  <p>This is what I need:</p>
  <pre><code>languages
  
  Spanish
  Spanish
  French
  German
  Russian
  English
  Portuguese
  English
  (...)
  </code></pre>
  <p>I am looking for an answer using <em>mutate</em> function from <strong>dplyr</strong></p>