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Can someone help me with this? I am really new to Latex and this really frustrates me

\documentclass[12pt]{article}
\usepackage[top=2.54cm, bottom=2.54cm, left=1.91cm, right=1.91cm]{geometry}
\usepackage[english,greek]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textgreek}
\babeltags{en = english}
\begin{document}
\title{Δισκόμορφοι Υγροί Κρύσταλλοι}
\author{Θεοδωρίδης Αθανάσιος}
\maketitle
\section*{1. Εισαγωγή}
Η μελέτη των υγρών κρυστάλλων ξεκίνησε το 1888 από τον βοτανολόγο \en{Friedrich Reinitzer} , ο οποίος εξέταζε τις ιδιότητες διαφόρων παραγώγων χοληστερίνης, και παρατήρησε την αλλαγή των ιδιοτήτων τους με την μεταβολή της θερμοκρασίας.
\end{document}
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    Don't show screenshots of code. We can't copy & paste them to test the issue. – Ulrike Fischer May 11 '18 at 13:42
  • sorry i will post the text then – Thanos May 11 '18 at 13:43
  • Welcome to TeX.SX! Does \usepackage[LGR,T1]{fontenc} help? Please include your code as copy-and-paste-able text in your question. An image is not searchable for text and we don't have to re-type its contents. – moewe May 11 '18 at 13:43
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    But I would not use the environment form of \begin{en}...\end{en} for two words. – moewe May 11 '18 at 13:51
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    BTW: I don't think you need \usepackage{textgreek} if you type Greek directly and don't use \textalpha etc. – moewe May 11 '18 at 13:59
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The documentation of the \babeltags command in the babel manual says (emphasis mine)

\babeltags{<tag1>=<language1>, <tag2>=<language2>, ...}

In multilingual documents with many language switches the commands above can be cumbersome. With this tool shorter names can be defined. It adds nothing really new – it is just syntactical sugar.

It defines \text<tag1>{<text>} to be \foreignlanguage{<language1>}{<text>}, and \begin{<tag1>} to be \begin{otherlanguage*}{<language1>}, and so on. Note \<tag1> is also allowed, but remember to set it locally inside a group.

This means that \en acts like a switch and not a macro. You want

\texten{Friedrich Reinitzer}

or {\en Friedrich Reinitzer} instead of \en{Friedrich Reinitzer}

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