Thank you for your suggestion…..in your situation, It actually depends on the font used for certain languages because some fonts do not have specific character support that some languages have or need. It usually means having to change the font. So for yours, it would mean that the Google font “Merienda”. To change it to something that would work for you, I would recommend a font plugin that let’s you try different fonts to see which one works for you. Try the WP Google Fonts plugin, and then for the headings, you would apply the font to the class:
.entry-title
For the other headings, you would also assign the font to these too:
h1, h2, h3, h4, h5, h6,
#equal-well nav.main-menu ul li
.main-navigation li
.more-link
.table th
