create documentation forlatex citations tab

en/latex-citations.md

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+---
+title: LaTeX Citations Tab
+helpCategories: ["Import/Export"]
+---
+
+This tool allows you to search for citations in LaTeX files.
+
+In the user interface, a tab was added to the entry editor, the aesthetics have been improved, and the tool was renamed to **Search for Citations in LaTeX files**.
+
+## LaTeX Citations Tab
+
+A new tab was added to the entry editor. It allows to search for citations to the active entry in the LaTeX file directory. It can be configured in the _Library properties_ dialog.
+
+See the image below to see how it works:
+
+!['LaTeX Citations' tab](https://user-images.githubusercontent.com/12954316/62509787-d68a0a80-b80c-11e9-84f5-f894f965dc9e.gif)
+
+## Key Features
+
+### The new tab
+
+- A _LaTeX Citations_ tab has been added to the entry editor.
+- This tab can be disabled in the _Entry editor_ preferences.
+- A progress indicator appears while parsing.
+- Current search is cancelled if another entry is selected.
+- Parsed files are stored when the tool is run for the first time (to achieve better performance).
+- The current search path is shown at the bottom, next to a button to set the LaTeX file directory.
+- A user-friendly error logging and handling has also been implemented.
+
+### A custom user interface controller for listing citations
+
+- The citations list view is the same for dialog tool and tab.
+- The context of citations is shown instead of the whole line of text (which is shown as a tooltip).
+- Absolute file path has been changed into a relative one, from the search path.
+- New icons and styles for context, file path, and position (line and column) of a citation.